Annals of Occupational and Environmental Medicine

Original Article

Association between sudden work recall and psychological health issues: a cross-sectional analysis of the 6th Korean Working Conditions Survey: Dong-Woo Kim, June-Hee Lee, In-Ho Lee, Kyung-Jae Lee; Ann Occup Environ Med 2025;37:e33. Published online September 8, 2025; DOI: https://doi.org/10.35371/aoem.2025.37.e33

Abstract Abstract in Korean PDF: Background
The impact of global integration has led to an increase in non-standard work patterns, threatening workers' health. Psychological health problems, such as anxiety and fatigue, negatively affect workers' health and safety. Sudden work recall, a situation where workers are asked to return to work under unpredictable circumstances, is associated with uncertainty. Research on the relationship between sudden work recall and anxiety and fatigue is limited, and this study aims to investigate this relationship among Korean workers.
Methods
The study used data from the 6th Korean Working Conditions Survey. To analyze the pure effects of sudden work recall, the final sample was limited to 15,702 non-shift workers with a ‘good’ subjective health status. The presence of sudden work recall was categorized into three frequency groups: “several times a month,” “rarely,” and “never.” Anxiety and fatigue were each categorized into "yes" or "no" responses. Multiple logistic regression analysis was performed.
Results
After adjusting for demographic and occupational characteristics, the odds ratio (OR) for anxiety in the 'several times a month' group was 4.066 (95% confidence interval [CI]: 2.787–5.931), indicating a significantly higher risk. Conversely, the OR for the 'rarely' group was 1.363 (95% CI: 0.921–2.017), which was not statistically significant. A similar pattern was observed for fatigue: the 'several times a month' group had a significantly higher risk (OR: 1.875; 95% CI: 1.490–2.359), but the 'rarely' group (OR: 0.955; 95% CI: 0.750–1.215) did not.
Conclusions
The relationship between sudden work recall and psychological health may not be a simple linear one. The results suggest that only a high frequency of sudden work recall is associated with an increased risk of anxiety and fatigue. Therefore, it is necessary to establish appropriate measures and to conduct additional research in this area.; 돌발적 업무 복귀 요청과 심리적 건강 문제의 연관성: 제 6차 근로환경조사를 이용한 단면 분석
목적
세계화로 인한 비정형적 근무 형태의 증가는 노동자의 건강을 위협하고 있다. 특히 불안과 피로와 같은 심리적 건강 문제는 삶의 질과 안전에 부정적인 영향을 미친다. 본 연구는 예측 불가능한 상황에서 갑자기 업무에 복귀하라는 요청을 받는 ‘돌발적 업무 복귀 요청’이 한국 노동자의 불안 및 피로와 어떤 연관성을 가지는지 조사하고자 한다.
방법
본 연구는 제6차 근로환경조사 자료를 활용했으며, 돌발적 업무 복귀 요청의 순수한 영향을 분석하기 위해 교대 근무자와 주관적 건강 상태가 ‘보통’ 이하인 근로자를 제외한 총 15,702명을 최종 분석 대상으로 선정했다. 돌발적 업무 복귀 요청의 빈도에 따라 ‘없음’, ‘드물게’, ‘한 달에 여러 번’으로 범주를 나누었으며, 다중 로지스틱 회귀분석을 통해 돌발적 업무 복귀 요청과 불안 및 피로 간의 연관성을 분석했다.
결과
인구통계학적 및 직업적 특성을 보정한 후, ‘한 달에 여러 번’ 돌발적 업무 복귀를 경험한 그룹은 불안(OR: 4.066, 95% CI: 2.787–5.931)과 피로(OR: 1.875, 95% CI: 1.490–2.359)의 위험이 유의미하게 높았다. 반면, ‘드물게’ 경험한 그룹은 불안(OR: 1.363, 95% CI: 0.921–2.017)과 피로(OR: 0.955, 95% CI: 0.750–1.215) 모두에서 통계적으로 유의미한 연관성이 나타나지 않았다.
결론
돌발적 업무 복귀 요구와 불안 및 피로의 관계는 단순히 선형적이지 않으며, 높은 빈도로 경험할 때만 유의미한 위험 증가와 관련이 있음을 시사한다. 돌발적인 업무 복귀 요청이 신체적 및 정신적 장애를 유발할 수 있는 가능성에 대한 연구는 제한적이며, 이러한 문제를 예방하기 위한 대책이 충분히 발전되지 않았다. 따라서 돌발적 업무 복귀와 관련된 근로자 건강 보호 및 예측 가능한 근무 환경 조성 분야에서 적절한 대책을 수립하고 추가적인 연구를 수행할 필요가 있다.

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Data Profile

Data profile: Korean Work, Sleep, and Health Study (KWSHS): Seong-Sik Cho, Jeehee Min, Heejoo Ko, Mo-Yeol Kang; Ann Occup Environ Med 2025;37:e3. Published online February 19, 2025; DOI: https://doi.org/10.35371/aoem.2025.37.e3

The Korean Work, Sleep, and Health Study (KWSHS) was launched in 2022 as a longitudinal panel study to examine the interactions between work conditions, sleep health, and labour market performance among the Korean workforce. Baseline data were collected from 5,517 participants aged 19 to 70, encompassing diverse occupations. Follow-up surveys occur biannually, accommodating seasonal variations in sleep and health dynamics. To ensure stability, refreshment samples were integrated in later waves, maintaining a cohort size of 5,783 participants in wave 5. Key data include socio-demographics, employment characteristics, sleep patterns, health outcomes, and workplace performance. Early findings highlight critical associations, such as the adverse effects of occupational physical activity on productivity, the impact of emotional labour on health-related productivity loss, and the significance of sleep disruptions on mental health. The cohort’s design enables detailed analyses of longitudinal and cross-sectional trends, offering insights into how changing work environments influence health and productivity. The KWSHS could serve as a vital resource for evidence-based interventions aimed at improving occupational health and productivity in Korea's evolving labour landscape. Data access is available through the study’s principal investigator upon request.

한국 직업, 수면 및 건강 연구(KWSHS)
한국 직업, 수면 및 건강 연구(KWSHS)는 한국 노동자의 근로 조건, 수면 건강, 노동 시장 성과 간 상호작용을 조사하기 위해 2022년에 시작된 종단적 패널 연구이다. 기초 자료는 다양한 직업군을 포함하여 19세에서 70세까지의 5,517명을 대상으로 수집하였다. 후속 설문조사는 수면 및 건강 역학의 계절적 변동성을 고려하여 2년마다 실시하며, 코호트의 안정성을 유지하기 위해 후속 조사에서는 보충 표본을 추가하여 5차 웨이브에서는 총 5,783명의 코호트 규모를 유지하였다. 주요 자료에는 사회인구학적 정보, 고용 특성, 수면 패턴, 건강 결과 및 직장 성과 등이 포함된다. 초기 연구 결과는 직업적 신체활동이 생산성에 미치는 부정적 영향, 감정 노동이 건강 관련 생산성 손실에 미치는 영향, 그리고 수면 장애가 정신 건강에 미치는 중요성을 포함한 주요 연관성을 강조하고 있다. 본 코호트의 설계는 종단적 및 횡단적 추세에 대한 세부적인 분석을 가능하게 하여 변화하는 근로 환경이 건강 및 생산성에 미치는 영향을 심층적으로 이해할 수 있게 한다. KWSHS는 한국의 변화하는 노동 환경 속에서 직업 건강 및 생산성을 향상시키기 위한 근거 기반 개입을 위한 중요한 자원이 될 수 있다. 데이터 접근은 연구 책임자에게 요청을 통해 가능하다.

Citations

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The Impact of Comorbid Insomnia and Sleep Apnea (COMISA) on Work Ability: Results From Population‐Based Panel Data in Korea
Heejoo Ko, Seong‐Sik Cho, Dong‐Wook Lee, Jaesung Choi, Min‐Seok Kim, Mo‐Yeol Kang
Journal of Sleep Research.2025;[Epub] CrossRef
Work ability and health-related productivity loss by chronotype: Results from population-based panel study
Heejoo Ko, Seong-Sik Cho, Mo-Yeol Kang
Sleep Health.2025; 11(5): 731. CrossRef
Work-related risk factors of sleep apnea: evidence from the Korean work, sleep, and health study
Heejoo Ko, Seong-Sik Cho, Hye-Eun Lee, Jeehee Min, Mo-Yeol Kang
International Archives of Occupational and Environmental Health.2025; 98(9-10): 797. CrossRef
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Journal of Sleep Research.2025;[Epub] CrossRef
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Original Article

The impact of long working hours on daily sodium intake: Kyungho Ju, Yangwoo Kim, Seung Hee Woo, Juhyeong Kim, Inah Kim, Jaechul Song, Soo-Jin Lee, Jeehee Min; Ann Occup Environ Med 2024;36:e9. Published online April 1, 2024; DOI: https://doi.org/10.35371/aoem.2024.36.e9

Abstract Abstract in Korean PDF

Background

Long working hours are associated with an increased risk of cardiovascular disease, yet the underlying mechanism(s) remain unclear. The study examines how occupational factors like working hours, shift work, and employment status correlate with dietary choices and sodium intake, impacting hypertension risk.

Methods

This study used data from the Korea National Health and Nutrition Examination Survey conducted between 2013 and 2020. The dataset included 8,471 respondents, all of whom were wage workers aged 20 or older and reported working at least 36 hours per week. Individuals who have been previously diagnosed with or are currently diagnosed with hypertension, diabetes, or dyslipidemia were excluded. The average daily sodium intake was assessed via a 24-hour dietary recall method. Average weekly working hours were categorized into 3 groups: 36–40 hours, 41–52 hours, and over 52 hours. Multiple logistic regression models were used.

Results

Study findings revealed that 83.7% of participants exceeded the recommended daily sodium intake of 2 g set by the World Health Organization. After adjusting for confounding factors, a positive correlation was observed between average working hours and daily sodium intake. Among males, statistical significance was found in the group with average weekly working hours of 41–52 hours (prevalence ratio [PR]: 1.17; 95% confidence interval [CI]: 1.05–1.30) and the group exceeding 52 hours (PR: 1.22; 95% CI: 1.09–1.38) when comparing the fourth quartile of daily sodium intake to the combined quartiles of Q1, Q2, and Q3. Among females, no significance was noted.

Conclusions

Long working hours were associated with increased sodium intake, primarily among male workers. This connection is likely attributed to having less time for home-cooked meals, resulting in higher fast food consumption and dining out. A workplace intervention promoting healthy eating and reducing stress is essential to lower sodium consumption and mitigate hypertension risk.

장시간 근무가 일일 소듐 섭취량에 미치는 영향
목적
장시간 근무는 심혈관 질환의 증가와 관련이 있다고 알려져 있지만, 그 메커니즘은 명확히 알려져 있지 않다. 본 연구는 주당 평균 근로시간, 교대근무 및 고용 형태 등의 직업적 요인과 식습관 변화 간의 관계를 확인하고, 특히 고혈압의 알려진 위험 요인인 과다한 소듐 섭취와의 관련성을 조사하였다.
방법
본 연구는 2013년부터 2020년까지 실시된 대한민국 국민건강영양조사의 데이터를 사용하였다. 연구대상자는 20세 이상의 임금 근로자, 주당 최소 36시간 이상 근무하는 자로 선정하였다. 이 외에도 다양한 인구학적, 직업 변수가 설문 조사를 통해 수집되었으며, 평균 일일 소듐 섭취량은 24시간 회상법을 통해 조사되었다. 주당 평균 근무 시간은 36-40시간, 41-52시간 및 52시간 이상의 세 집단으로 분류되었다. 다중 로지스틱 회귀 모델이 분석에 사용되었다.
결과
연구대상자 중 83.7%가 세계보건기구(WHO)에서 권장한 일일 나트륨 섭취량인 2g을 초과한 것이 확인되었다. 교란변수 보정 후에도 주당 평균 근로시간과 일일 소듐 섭취 간의 통계적 유의성이 확인되었다. 남성에 대하여, 주당 평균 근무 시간이 41-52시간인 그룹 (PR: 1.17, 95% CI: 1.05-1.30)과 52시간을 초과한 그룹 (PR: 1.22, 95% CI: 1.09-1.38)이 일일 소듐 섭취량 4분위에서 1, 2, 3분위를 포함한 그룹과와 비교하여 통계적으로 유의미한 관련이 있었다. 여성에 대하여는 통계적으로 유의미하지 않았다.
결론
장시간 근무는 주로 남성 근로자에서 소듐 섭취 증가와 관련이 있었다. 이는 가정에서 조리하는 시간이 줄어들어 패스트 푸드 및 외식 소비가 증가하는 것에 기인한 것으로 생각된다. 과량의 소듐 섭취는 고혈압의 알려진 위험 요인이므로, 직장에서의 적극적인 개입을 통해, 더 건강한 식습관과 개선된 근무 환경을 통해 소듐 섭취를 줄이는 것이 필요하다.

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Original Article

Risk of insomnia symptoms according to Work-Family Conflict by workers’ characteristics: Kwanghyun Seo, Seungjun Ryu, Saebomi Jeong, Hee-Tae Kang, Sung-Kyung Kim, Sang-Baek Koh, Kyoung Sook Jeong, Sung-Soo Oh; Ann Occup Environ Med 2023;35:e36. Published online August 23, 2023; DOI: https://doi.org/10.35371/aoem.2023.35.e36

Abstract Abstract in Korean PDF

Background

Work-Family Conflict means that the demands of work and family roles cannot be met simultaneously, so one cannot concentrate on one’s work or family role. This conflict can negatively affect mental health and cause insomnia symptoms.

Methods

This study was conducted on 20,442 subjects. Insomnia symptoms were assessed using the Minimal Insomnia Symptom Scale, and other variables were assessed using the questionnaire method. Logistic regression analyses were performed to evaluate the effect of Work-Family Conflict on insomnia symptoms, and subgroup logistic regression analyses were also performed.

Results

The number of people with insomnia symptoms was 4,322 (15.1%). Compared with Low Work-Family Conflict, the odds ratios (ORs) for the risk of insomnia symptoms were 1.84 (95% confidence interval: 1.56–2.16) in High work-to-family conflict, 1.16 (1.02–1.32) in High family-to-work conflict, and 3.19 (2.87–3.55) in High Work-Family Conflict. The ORs were higher for men than women in High WFC but higher for women than men in High Work-Family Conflict.

Conclusions

The risk of insomnia symptoms was highest in High Work-Family Conflict.

근로자 특성별 일-가정 갈등에 따른 불면증 증상의 발생 위험
목적
일-가정 갈등이 근로자의 불면증 증상 발생에 미치는 영향을 확인하고자 한다.
방법
이 연구는 20,442명의 피험자를 대상으로 수행되었다. 불면증 증상은 Minimal Insomnia Symptom Scale을 사용하여 평가하였고, 기타 변수는 설문지 방법을 사용하여 수집하였다. 일-가정 갈등이 불면증 증상 발생에 미치는 영향을 알아보기 위해 로지스틱 회귀 분석을 수행하였으며, 하위그룹 로지스틱 회귀 분석 또한 수행하였다.
결과
불면증이 있는 사람은 4,322명(15.1%)이었다. 전체 일-가정 갈등이 낮은 근로자와 비교했을 때, 불면증 증상 발생에 대한 오즈비는 WFC가 높은 근로자에서 1.84(95% 신뢰 구간 1.56-2.16), FWC가 높은 근로자에서 1.16(95% CI 1.02-1.32), 전체 일-가정 갈등이 높은 근로자에서 3.19(95% CI 2.87-3.55)이었다. 남성과 여성을 나누어 분석했을 때, WFC가 높은 근로자에서는 남성이 여성보다 오즈비가 높았으나 전체 일-가정 갈등이 높은 근로자에서는 여성이 남성보다 오즈비가 높았다.
결론
전체 일-가정 갈등이 높은 근로자에서 불면증 증상의 발생 위험이 가장 컸다.

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[Special Collection] Working hours as a social determinants of workers' health

Brief Communication

The impacts of working time flexibilization on occupational safety and health: an expert survey: Daseul Moon, Hyunjoo Kim; Ann Occup Environ Med 2023;35:e20. Published online July 20, 2023; DOI: https://doi.org/10.35371/aoem.2023.35.e20

Abstract PDF Supplementary Material

The policy proposal by the current Korean government that proposes flexible overtime rules is causing social controversy. This study has explored the 612 experts’ opinions on the occupational safety and health impacts of the policy using an online self-report survey. They expected short-term overwork (87.25%), overwork inequality (86.44%), irregular working hours (84.31%), chronic overwork (84.15%), long working hours (83.66%), and unpredictability of working hours (81.86%) as a result of the policy change. They also responded that the policy change would increase industrial accident deaths (87.25%), mental illnesses (87.09%), deaths due to overwork or cardiovascular diseases (83.84%), and accidents (83.33%). They disagreed that the government’s flexibilization policy, while agreeing that the necessity of policies on regulating night work (94.77%), guaranteeing wages to eliminate overtime (90.36%), establishing working time regulations for the bogus self-employed (82.84%), and applying the 52-hour workweek system to all workplaces (76.47%). These expert opinions are consistent with previous research on the health effects of working hours.

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[Special Collection] Working hours as a social determinants of workers' health

Brief Communication

Working hours and the regulations in Korea: Inah Kim, Jeehee Min; Ann Occup Environ Med 2023;35:e18. Published online July 6, 2023; DOI: https://doi.org/10.35371/aoem.2023.35.e18

Abstract PDF Supplementary Material

South Korea has the highest policy priority for working hour regulations because it has longer annual working hours than other Organization for Economic Development Co-operation and Development countries and has fewer holidays. According to the results of the Working Conditions Surveys between 2006 and 2020, in 2020, 6% of wage earners worked for > 52 hours weekly. The percentage of workers exceeding 52 hours weekly has decreased over time; however, disparities exist based on age, industry, occupation, company type, and company size, particularly in service-, arts-, and culture-related occupations and workplaces with fewer than 5 employees. South Korea’s working hours system is greatly influenced by the 52-hour weekly maximum; sometimes, a maximum of 64–69 hours, including overtime, is theoretically possible. To ensure healthy working hours, it is important to actively protect workers who fall through the cracks, such as those in businesses with fewer than 5 employees.

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Original Article

Correlation of commute time with the risk of subjective mental health problems: 6^th Korean Working Conditions Survey (KWCS): Hyo Choon Lee, Eun Hye Yang, Soonsu Shin, Seoung Ho Moon, Nan Song, Jae-Hong Ryoo; Ann Occup Environ Med 2023;35:e9. Published online May 11, 2023; DOI: https://doi.org/10.35371/aoem.2023.35.e9

Abstract Abstract in Korean PDF

Background

Studies conducted so far on the link between commute time and mental health among Koreans remain insufficient. In this study, we attempted to identify the relationship between commute time and subjective mental health using the 6^th Korean Working Conditions Survey (KWCS).

Methods

Self-reported commute time was divided into four groups: ≤ 30 (group 1), 30–60 (group 2), 60–120 (group 3), and > 120 minutes (group 4). Subjective depression was defined as a score of 50 points or less on the WHO-5 well-being index. Subjective anxiety and fatigue were defined as answering ‘yes’ to the questionnaire on whether they had experienced it over the past year. The analysis of variance, t-test, and χ² test was used to analyze the differences among the characteristics of the study participants according to commute time, depression, anxiety, and fatigue. Odds ratios (ORs) and 95% confidence intervals (CIs) for depression, anxiety, and fatigue according to commute time were calculated using multivariate logistic regression models adjusted for sex, age, monthly income, occupation, company size, weekly working hours, and shift work status.

Results

Long commute times showed increased ORs and graded increasing trends for depression, anxiety, and fatigue. The ORs for depression increased significantly in group 2 (1.06 [1.01–1.11]), group 3 (1.23 [1.13–1.33]), and group 4 (1.31 [1.09–1.57]) compared to group 1 (reference). The ORs for anxiety increased significantly in group 2 (1.17 [1.06–1.29]), group 3 (1.43 [1.23–1.65]) and group 4 (1.89 [1.42–2.53]). The ORs for fatigue increased significantly in group 2 (1.09 [1.04–1.15]), group 3 (1.32 [1.21–1.43]), and group 4 (1.51 [1.25–1.82]).

Conclusions

This study highlights that the risk of depression, anxiety, and fatigue increases with commute time.

통근 시간과 주관적 정신건강문제 위험의 상관관계 : 제6차 한국근로환경조사
목적
한국인들의 통근 시간과 정신 건강의 관계에 대해 지금까지 수행된 연구는 매우 부족하다. 본 연구에서는 제6차 한국근로환경조사 자료를 이용하여 통근 시간과 주관적 정신건강의 관계를 규명하고자 하였다.
방법
자가 보고된 통근 시간은 30분 이하(1군), 30분-60분(2군), 60분-120분(3군), 120분 초과(4군)의 4개 그룹으로 분류하였다. 주관적 우울은 WHO-5 웰빙 지수 50점 이하인 경우로 정의하였다. 주관적 불안과 피로는 지난 1년간 이러한 증상을 경험한 적이 있는지에 대한 설문지에 '그렇다'고 대답한 경우로 정의하였다. 분산분석, T-검정 및 카이-제곱 검정을 사용하여 출퇴근 시간, 우울, 불안, 피로에 따른 연구 참여자들의 특성 차이를 분석하였다. 성별, 연령, 월 소득, 직업, 회사 규모, 주당 근로 시간, 교대근무 상태를 보정한 다변량 로지스틱 회귀모형을 이용하여, 통근 시간에 따른 우울, 불안, 피로에 대한 오즈비와 95% 신뢰구간을 산출하였다.
결과
긴 통근 시간은 우울, 불안, 피로에 대한 오즈비 증가 및 점진적인 상승 추세를 보여주었다. 우울에 대한 오즈비는 2군(1.06[1.01-1.11]), 3군(1.23[1.13-1.33])과 4군(1.31[1.09-1.57])에서 1군(참조군)에 비해 유의하게 증가하였다. 불안에 대한 오즈비는 2군(1.17[1.06-1.29]), 3군(1.43[1.23-1.65])과 4군(1.89[1.42-2.53])에서 유의하게 증가했다. 피로에 대한 오즈비는 2군(1.09[1.04-1.15]), 3군(1.32[1.21-1.43])과 4군(1.51[1.25-1.82])에서 유의하게 증가했다.
결론
본 연구는 출퇴근 시간이 증가함에 따라 우울증, 불안, 피로의 위험이 증가한다는 것을 강조한다.

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Original Article

Relationship between visual display terminal working hours and headache/eyestrain in Korean wage workers during the COVID-19 pandemic: the sixth Korean Working Conditions Survey: Gayoung Kim, Seong-yong Cho, Jinseok Kim, Seongyong Yoon, Jisoo Kang, Si young Kim; Ann Occup Environ Med 2023;35:e8. Published online May 9, 2023; DOI: https://doi.org/10.35371/aoem.2023.35.e8

Abstract Abstract in Korean PDF: Background
Prolonged use of visual display terminal (VDT) can cause eyestrain, dry eyes, blurred vision, double vision, headache and musculoskeletal symptoms (neck, shoulder, and wrist pain). VDT working hours among workers have greatly increased during the coronavirus disease 2019 (COVID-19) pandemic. Therefore, this study aimed to investigate the relationship between VDT working hours and headache/eyestrain in wage workers using data from the sixth Korean Working Conditions Survey (KWCS) (2020–2021) conducted during the COVID-19 pandemic.
Methods
We analyzed the sixth KWCS data of 28,442 wage workers aged 15 years or older. The headache/eyestrain that occurred in the last year was assessed. The VDT work group included workers who use VDT always, almost always, and three-fourth of the working hours, while the non-VDT work group included workers who use VDT half of the working hours, one-fourth of the working hours, almost never, and never. To analyze the relationship between VDT working hours and headache/eyestrain, the odds ratios (ORs) and 95% confidence interval (CI) were calculated using logistic regression analysis.
Results
Among the non-VDT work group, 14.4% workers experienced headache/eyestrain, whereas 27.5% workers of the VDT work group experienced these symptoms. For headache/eyestrain, the VDT work group showed adjusted OR of 1.94 (95% CI: 1.80–2.09), compared with the non-VDT work group, and the group that always used VDT showed adjusted OR of 2.54 (95% CI: 2.26–2.86), compared with the group that never used VDT.
Conclusions
This study suggests that during the COVID-19 pandemic, as VDT working hours increased, the risk of headache/eyestrain increased for Korean wage workers.; 코로나 19 유행 시기의 임금근로자에서 영상표시단말기(VDT) 작업시간과 두통/눈피로의 연관성: 제 6차 근로환경조사(KWCS)
목적
영상표시단말기(VDT)를 장시간 사용하면 눈의 피로, 안구 건조, 시야 흐림, 복시, 두통 및 근골격계 증상(목, 어깨 및 손목 통증)을 유발할 수 있다. 코로나19의 유행 동안 근로자들의 VDT 근로시간이 크게 증가했다. 본 연구는 코로나19 유행 시기에 실시된 제6차 KWCS(2020-2021) 자료를 활용하여 임금근로자의 VDT 근로시간과 두통/눈피로의 연관성을 조사하고자 하였다.
방법
본 연구는 15세 이상 임금근로자 28,442명을 대상으로 제6차 KWCS 자료를 분석하였다. 두통/눈피로는 지난 1년 동안 발생 여부로 확인하였다. 근무시간 내내, 거의 모든 근무시간, 근무시간 3/4 동안 VDT를 사용할 경우 VDT 작업군으로 분류하였고, 근무시간 절반, 근무시간 1/4, 거의 없음, 전혀 사용하지 않는 경우 VDT 비작업군으로 분류하였다. VDT 근무시간과 두통/눈피로의 관계를 분석하기 위해 로지스틱 회귀분석을 이용하여 승산비(OR)와 95% 신뢰구간(CI)을 계산하였다.
결과
본 연구는 15세 이상 임금근로자 28,442명을 대상으로 제6차 KWCS 자료를 분석하였다. 두통/눈피로는 지난 1년 동안 발생 여부로 확인하였다. 근무시간 내내, 거의 모든 근무시간, 근무시간 3/4 동안 VDT를 사용할 경우 VDT 작업군으로 분류하였고, 근무시간 절반, 근무시간 1/4, 거의 없음, 전혀 사용하지 않는 경우 VDT 비작업군으로 분류하였다. VDT 근무시간과 두통/눈피로의 관계를 분석하기 위해 로지스틱 회귀분석을 이용하여 승산비(OR)와 95% 신뢰구간(CI)을 계산하였다.
결론
본 연구는 코로나19 세계적 유행 기간 동안 VDT 근로시간이 증가함에 따라 한국 임금근로자의 두통/눈피로 위험이 증가함을 시사한다.

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Original Article

Relationship between workplace violence and work-related depression/anxiety, separating the types of perpetrators: a cross-sectional study using data from the fourth and fifth Korean Working Conditions Surveys (KWCS): Na-Rae Lee, Sang-Woo Kim, Jae-Han Joo, Jae-Han Lee, June-Hee Lee, Kyung-Jae Lee; Ann Occup Environ Med 2022;34:e13. Published online June 10, 2022; DOI: https://doi.org/10.35371/aoem.2022.34.e13

Abstract Abstract in Korean PDF Supplementary Material

Background

Work is an inseparable element of a person’s life, and violence in the workplace has various effects on individual workers and companies. While most studies have focused on specific industries, very few studies have investigated the influence of workplace violence by co-workers. Therefore, this study aimed to evaluate the association between workplace violence and work-related depression/anxiety in various occupations by differentiating the perpetrators of violence as co-workers and clients.

Methods

This study was conducted based on data from the 4th and 5th Korean Working Conditions Surveys (KWCS). The experience of workplace violence was classified in terms of the perpetrator: workplace violence by co-workers and that by clients. Work-related depression and anxiety were assessed using questions about health problems related to depression and anxiety and whether the problems were related to work. Descriptive statistics, χ² tests, and multiple logistic regression analyses were performed using the SPSS 26.0.

Results

After adjusting for sociodemographic characteristics (age, education, income, subjective health status) and occupational characteristics (occupation, weekly working hours, type of employment, size of workplace, and shift work), male workers with experience of workplace violence by co-workers were found to be at a higher risk of work-related depression/anxiety (odds ratio [OR], 11.52; 95% confidence interval [CI], 8.65–15.36). The same was confirmed for female workers (OR, 10.89; 95% CI, 7.90–15.02).

Conclusions

Employees who experienced workplace violence from co-workers were found to be more vulnerable to work-related depression/anxiety. Continuous contact between the victim and the perpetrator may occur, and the possibility of a secondary assault can frighten the victim. Appropriate prevention and intervention measures that focus on the perpetrators of violence are needed.

가해자 유형별 작업장 폭력과 업무 관련 우울/불안의 연관성
목적
작업장 폭력은 근로환경에서 타인에게 의도적으로 상해, 사망, 정신적 손상, 발달장애 또는 결핍을 일으키는 행위나 위협을 가하는 것으로, 근로자의 신체적·정신적 건강에 부정적 영향을 미치며 기업의 생산성을 저해한다. 작업장 폭력에 대한 대다수의 연구는 특정 직종에 초점을 맞추고 있어 직장 동료에 의해 내부에서 발생하는 작업장 폭력의 영향이 잘 반영되지 않을 수 있다. 본 연구를 통해 가해자 유형별 업무 관련 우울/불안의 연관성을 비교‧확인하고자 한다.
방법
제 4차 및 제 5차 근로환경조사를 바탕으로, 만 18세 이상 피고용자 55,201 명에서 작업장 폭력에 대한 경험과 그 가해자 및 업무 관련 우울/불안 유무를 분석하였다. SPSS 26.0을 통해 기술통계, 카이제곱검정 및 다중로짓회귀분석을 시행했고, 직장 동료 혹은 고객에 의해 작업장 폭력을 경험한 근로자에서 작업장 폭력을 경험하지 않은 근로자에 비해 업무 관련 우울/불안이 있을 위험에 대한 Odds ratio [OR]를 구하였다.
결과
성별을 막론하여 직장 동료 혹은 고객에 의해 작업장 폭력을 경험한 근로자의 경우 작업장 폭력을 경험하지 않은 근로자에 비해 업무 관련 우울/불안의 빈도가 유의하게 높았다. 작업장 폭력을 경험한 남성 근로자에서 업무 관련 우울/불안에 대한 OR은 가해자가 직장 동료일 경우 11.52 (95% Confidence interval [CI] 8.65-15.36), 고객일 경우 5.06 (95% CI 3.73-6.88)으로 나타났으며, 여성 근로자의 경우에도 마찬가지로 가해자가 직장 동료일 경우 OR 10.89 (95% CI 7.90-15.02), 고객일 경우 OR 4.94 (95% CI 3.77-6.47)로 나타났다.
결론
작업장 폭력을 경험한 근로자는 작업장 폭력 경험이 없는 근로자에 비해 업무 관련 우울/불안의 위험이 더 크다. 작업장 폭력의 가해자가 직장 동료일 경우, 피해자와 가해자가 동일 작업장 내에서 지속적으로 접촉하여 폭력에 대한 반복적인 회상 또는 2차 가해 등이 이루어지기 쉬운 환경이 조성되기 때문에 고객에 의한 작업장 폭력에 비해 업무 관련 우울/불안의 위험이 더 크게 나타날 수 있다. 작업장 폭력의 가해자를 고려한 적절한 예방 및 중재 조치가 필요하며, 해당 분야에 대해 후속 연구가 이루어져야 할 것으로 생각된다.

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Original Article

Analysis of self-reported mental health problems among the self-employed compared with paid workers in the Republic of Korea: Yongho Lee, Junhyeong Lee, Ui-Jin Kim, Eunseun Han, Seunghon Ham, Won-Jun Choi, Seong-Kyu Kang, Wanhyung Lee; Ann Occup Environ Med 2022;34:e8. Published online April 8, 2022; DOI: https://doi.org/10.35371/aoem.2022.34.e8

Abstract Abstract in Korean PDF

Background

As self-employed workers are vulnerable to health problems, this study aimed to analyze mental health problems and sleep disturbances among self-employed workers compared with paid workers in Korea.

Methods

A total of 34,750 workers (23,938 paid workers and 10,812 self-employed workers) were analyzed from the fifth Korean Working Condition Survey, which included 50,205 households collected by stratified sampling in 2017. To compare mental health problems and sleep disturbance among self-employed workers and paid workers, multivariate logistic regression analyses were performed.

Results

The odds ratio in self-employed workers compared with paid workers was 1.25 (95% confidence interval [CI]: 1.09–1.42) for anxiety, 1.11 (95% CI: 1.04–1.17) for overall fatigue, 1.11 (95% CI: 1.04–1.20) for difficulty falling asleep, 1.10 (95% CI: 1.02–1.18) for difficulty maintaining sleep and 1.24 (95% CI: 1.16–1.32) for extreme fatigue after waking up.

Conclusions

Self-employed workers in Korea have a higher risk of self-reported mental health problems and sleep disturbances than paid workers. Further studies with a longitudinal design and structured evaluation are required to investigate the causal relationship between health problems and self-employment.

한국 자영업자의 주관적 정신건강 문제 : 제 5차 근로환경조사를 이용하여
목적
자영업자는 고용, 사업체 운영 등에 대한 스트레스를 받고 있으며 자신들의 건강관리에 취약한 것으로 여겨지고 있다. 이 연구는 자영업자들에게 초점을 맞춰 유급근로자들과 비교하여 정신건강 문제와 수면 장애를 분석하는 것을 목표로 하였다.
방법
이 연구는 한국의 5차 근로환경조사 데이터를 바탕으로 23,938명의 유급근로자와 10,812명의 자영업자들을 선택하여 분석을 수행하였다. 정신건강 문제는 ‘우울감’, ‘불안감’, ‘전신 피로’에 대한 설문과 수면 장애는 ‘잠들기가 어려움’, ‘자는 동안 반복적으로 깨어남’, ‘기진맥진함 또는 극도의 피곤함을 느끼며 깨어남’ 설문의 답변을 이용하였다. 자영업자의 정신건강 문제와 수면 장애를 분석하기 위해 다변량 로지스틱 회귀 분석을 시행하였다.
결과
자영업자에서의 ‘불안감’에 대한 보정된 오즈비는 1.25 (95% CI=1.09-1.42), ‘전신피로’는 1.11 (95% CI=1.04-1.17), ‘잠들기가 어려움’은 1.11 (95% CI=1.04-1.20), ‘자는 동안 반복적으로 깨어남’은 1.10 (95% CI=1.02-1.18) 그리고 ‘기진맥진함 또는 극도의 피곤함을 느끼며 깨어남’은 1.24 (95% CI=1.16-1.32)이었다.
결론
본 연구는 유급근로자에 비해 자영업자들의 정신건강 문제와 수면 장애의 위험성이 높은 것을 확인할 수 있었다. 자영업자들의 건강 보호와 증진을 위해 구조화된 설문, 전향적 연구 등의 추가적인 연구와 사회의 관심이 필요하다.

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Original Article

The association between direct supervisor's behavior and employee presenteeism in Korean wage workers: findings from the fifth Korean Working Condition Survey: Sung Hee Lee, Joo Hyun Sung, Dae Hwan Kim, Chang Sun Sim; Ann Occup Environ Med 2021;33:e30. Published online September 24, 2021; DOI: https://doi.org/10.35371/aoem.2021.33.e30

Abstract PDF Supplementary Material

Background

Presenteeism is a phenomenon in which employees go to work, but physical or mental health problems make it impossible for them to properly demonstrate their abilities, and productivity decreases accordingly. Recent studies have considered the behavior of direct supervisors to be an important factor in the pathogenesis of various health-related outcomes. This study aimed to investigate the association between the direct supervisor's behaviors and presenteeism among wage workers in South Korea.

Methods

A total of 25,798 participants from the fifth Korean Working Condition Survey conducted in 2017 were included in the analysis. The behaviors of direct supervisor were assessed by 6 questionnaire items. In this study, the distribution of the scores was categorized into 4 categories (very good, good, bad, and very bad). To assess presenteeism, the corresponding questionnaire item was used. χ² tests and multiple logistic regression analyses adjusted for general, occupational, and psychosocial factors were performed to determine the association between the behaviors of direct supervisor and presenteeism.

Results

Direct supervisor's behavior were significantly associated with presenteeism. The adjusted odds ratios (aORs) of presenteeism in the good, bad, and very bad groups were 1.297 (95% confidence interval [CI]: 1.153–1.458), 1.191 (95% CI: 0.941–1.507), and 1.604 (95% CI: 1.184–2.175), compared with the very good group. Associations between presenteeism and the behaviors of direct supervisor were significant in male workers, but not in female workers. For male workers, the aORs of presenteeism in the good, bad, very bad groups were 1.661 (95% CI: 1.425–1.936), 1.445 (95% CI: 1.053–1.982), 2.340 (95% CI: 1.569–3.491), respectively.

Conclusions

This study suggests that the behavior of a direct supervisor can influence the occurrence of presenteeism, particularly in men. The proper management of senior employee's behaviors is necessary to reduce the risk of presenteeism in the workplace.

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Original Article

Association between split shift work and work-related injury and disease absence: Kwon Ko, Jae Bum Park, Kyung-Jong Lee, Inchul Jeong; Ann Occup Environ Med 2021;33:e27. Published online August 19, 2021; DOI: https://doi.org/10.35371/aoem.2021.33.e27

Abstract PDF Supplementary Material

Background

Shift work (particularly split shifts) has been noted among the working conditions that hinder sustainable work. However, little is known regarding the effects of split shifts on health. This study aimed to investigate the association between split shift work and work-related injury and disease absence.

Methods

This study used data from the fifth Korean Working Conditions Survey and included 4,042 paid shift workers. Shift work type and self-reported work-related injury and disease absence were investigated using a questionnaire. Logistic regression analysis was performed to investigate the association between split shift work and work-related absence with rotating shift worker as the reference group.

Results

Of the 4,042 shift workers, 980 (24.3%) were split shift workers. The adjusted odds ratio (aOR) of split shift for absence due to work-related injury was high at 2.94 (95% confidence interval [CI]: 1.85–4.68) and the aOR of split shift for absence due to work-related disease was also high at 1.58 (95% CI: 1.09–2.29) compared to rotating shift.

Conclusions

Split shift work leads to an increased risk of absences due to work-related injury and disease.

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Original Article

Sunlight exposure and eye disorders in an economically active population: data from the KNHANES 2008-2012: Junhyeong Lee, Ui-Jin Kim, Yongho Lee, Eunseun Han, Seunghon Ham, Wanhyung Lee, Won-Jun Choi, Seong-Kyu Kang; Ann Occup Environ Med 2021;33:e24. Published online July 16, 2021; DOI: https://doi.org/10.35371/aoem.2021.33.e24

Abstract Abstract in Korean PDF

Background

Sunlight exposure is a major risk factor for eye disorders. Most outdoor workers cannot avoid sunlight exposure. This study aimed to analyze the relationship between outdoor sunlight exposure and eye disorders in an economically active population.

Methods

This study analyzed the 2008–2012 Korea National Health and Nutritional Examination Survey data. Sunlight exposure was categorized as < 5 hours and > 5 hours. We also analyzed the dose-dependent relationship between exposure to sunlight and eye disorders (cataracts, pterygium, and age-related macular degeneration [AMD]) using data from 2010 to 2012 by subdividing the exposure groups into < 2 hours, 2–5 hours, and ≥ 5 hours. Eye disorders were diagnosed by an ophthalmologist. The study participants were stratified by sex, and the results were analyzed using the χ² test and multiple logistic regression analysis.

Results

In the female group, the odds ratio of pterygium in the high-level sunlight exposure group was 1.47 (95% confidence interval [CI]: 1.15–1.89). Regarding AMD, the odds ratios were 1.42 (95% CI: 1.16–1.73), 1.33 (95% CI: 1.03–1.73), and 1.58 (95% CI: 1.15–2.16) in the total, male, and female groups, respectively. Analysis of the dose-response relationship revealed that the odds ratios of pterygium in the high-level sunlight exposure subgroups of the total and female groups were 1.62 (95% CI: 1.25–2.08) and 2.00 (95% CI: 1.39–2.88), respectively.

Conclusions

This study demonstrated a relationship between sunlight exposure and eye disorders in an economically active population. Women were found to be especially vulnerable to pterygium. However, additional prospective studies to clarify the pathophysiology of pterygium are needed.

경제활동인구의 햇빛노출과 안질환:2008-2012 국민건강영향조사 자료 분석
목적
햇빛 노출은 안질환의 주된 위험인자이며, 일반 인구집단에서 안질환 유병률과의 관련이 잘 알려져 있다. 옥외작업자는 자신의 의지로 햇빛 노출을 피할 수 없을 가능성이 높다. 본 연구는 경제활동인구의 옥외 햇빛 노출과 안구 질환의 관계를 분석하는 것을 목적으로 하였다.
방법
이 연구는 2008-2012년 국민건강영양조사 자료를 집계하여 사용하였다. 햇빛 노출은 5시간 미만과 5시간 이상 노출 그룹으로 세분화되었으며, 2010-2012년 자료를 활용해 2시간 미만, 2-5시간, 5시간 이상 노출 그룹으로 세분화하여 양-반응 관계 분석을 시행하였다. 안질환은 안과의사에 의해 진단되었다. 연구 참여 집단을 성별로 층화하여 카이제곱 분석과 다중 로지스틱 회귀분석을 시행하였다.
결과
여성 집단에서 햇빛 고노출군의 익상편 유병 오즈비는 1.47 (95% CI=1.15-1.89)이었다. 나이관련황반변성의 경우 전체 집단에서 유병 오즈비는 1.42(95% CI=1.16-1.73), 남성 집단에서 1.33 (95% CI=1.03-1.73), 여성 집단에서 1.58 (95% CI=1.15-2.16)이었다. 양-반응 관계 분석 결과 햇빛 고노출군에서 전체 집단의 익상편 유병 오즈비는 1.62 (95% CI=1.25-2.08)이었고, 여성 집단에서는 2.00(95% CI=1.39-2.88)이었다.
결론
본 연구는 몇 가지 제한점이 있지만 경제활동인구에서의 햇빛 노출과 안질환 유병률에 대한 관계에 대한 정보를 제공한다. 특히 익상편의 경우 여성이 더 취약한 것으로 나타났는데, 발병기전을 고려한 전향적 연구 등의 추가적인 연구가 필요하다.

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Research Article

The association between non-regular work patterns and insomnia among Korean wage workers: the fifth Korean working condition survey: Ho-Yeon Kim, Juho Choi, Hyun-Mook Lim, Chamjin Park, Yun-Chul Hong; Ann Occup Environ Med 2021;33:e9. Published online March 29, 2021; DOI: https://doi.org/10.35371/aoem.2021.33.e9

Abstract PDF

Background

Non-regular workers are steadily increasing on account of improving corporate productivity. They are classified as non-permanent, part-time, or non-typical workers. Non-regular work has a negative impact on workers' physical and mental health. This study analyzed the relationship between non-permanent, part-time and non-typical work and insomnia among Korean wage workers, and investigated the differences and interactions between different work patterns.

Methods

The Fifth Korean Working Conditions Survey was used in this study. Non-regular work patterns were classified into 7 types: type 1, sole non-permanent; type 2, sole part-time; type 3, sole non-typical; type 4, part-time-non-typical; type 5, non-permanent-non-typical; type 6, non-permanent-part-time; type 7, all inclusive. Insomnia was measured on a scale from “normal sleep” to “insomnia” based on the 3-item Minimal Insomnia Symptom Scale. Multiple logistic regression was used to analyze the association between non-regular work patterns and insomnia among wage workers.

Results

After multivariate adjustment, a significantly increased odds ratio (OR) for insomnia was found in types 1, 2, 3, 4, 5, 6, and 7 of non-regular work patterns compared to regular work patterns. After stratification for shift and night work, the OR of the group with shift and night work was higher than that of the group without shift and night work.

Conclusions

Insomnia was significantly associated with non-regular work patterns. This association was prominent in workers with shifts and night work. This finding suggests that proper work patterns may be needed to reduce the risk of insomnia among Korean wage workers and workers who initially had insomnia should consider these results before placement.

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Research Article

Relationship between job rotation and work-related low back pain: a cross-sectional study using data from the fifth Korean working conditions survey: Ji-Su Shin, Kwanghyun Seo, Hyun-Jeong Oh, MyeongSeob Lim, Hee-Tae Kang, Kyeong-Sook Jeong, Sang-Baek Koh, Sung-Kyung Kim, Sung-Soo Oh; Ann Occup Environ Med 2021;33:e3. Published online January 28, 2021; DOI: https://doi.org/10.35371/aoem.2021.33.e3

Abstract PDF

Background

Job rotation was introduced in various industries as a strategic form of work for improving workers' job skills and health management. This study aims to examine the relationship between job rotation and work-related low back pain (LBP), one of the typical work-related musculoskeletal symptoms of Korean workers.

Methods

We conducted this study using the data of the 5th Korean Working Conditions Survey (KWCS). As the subject of this study, 27,163 wage workers were selected, and classified into three groups according to occupational type (white-collar, service and sales, and blue-collar). In this study, job rotation means to change the work-related activities with other colleagues periodically and work-related LBP was defined as whether there was work-related LBP in the last 12 months. Chi-square test and logistic regression were used to analyze the relationship between job rotation and work-related LBP.

Results

Out of 27,163 workers, 2,421 (8.9%) answered that they had job rotation and 2,281 (8.4%) answered that they experienced work-related LBP. According to the results from logistic regression, job rotation was significantly associated with low prevalence of work-related LBP among blue-collar workers (odds ratio [OR]: 0.71, 95% confidence interval [CI]: 0.58–0.88), whereas no significant relationship was observed among white-collar, service and sales groups. In addition, the negative association between job rotation and work-related LBP among blue-collar workers was more pronounced when exposed to ergonomic risk factors (uncomfortable posture OR: 0.79, 95% CI: 0.64–0.98; heavy work OR: 0.74, 95% CI: 0.57–0.96; repetitive work OR: 0.74, 95% CI: 0.60–0.92).

Conclusions

Job rotation was associated with low prevalence of work-related LBP among workers in the blue-collar occupational group in Korea. It is necessary to evaluate the effect of job rotation by occupational type and introduce an appropriate method of job rotation to reduce workers' work-related musculoskeletal symptoms.

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The association between effort-reward imbalance, work-life balance and depressive mood in Korean wage workers: The 4th Korean Working Conditions Survey: Hyun-mook Lim, Cham-jin Park, Ji-hoo Yook, Min-seok Kim, Ho-yeon Kim, Yun-Chul Hong; Ann Occup Environ Med 2021;33:e2. Published online January 25, 2021; DOI: https://doi.org/10.35371/aoem.2021.33.e2

Abstract PDF

Background

This study was conducted to determine the association between work-life (WL) balance, effort-reward (ER) imbalance, and depressive mood in Korean wage workers when 2 models were considered simultaneously.

Methods

We analyzed 26,014 Korean workers including 13,471 men and 12,543 women from the 4th Korean Working Conditions Survey data. Multiple logistic regression was used to analyze the association between WL, ER status, and the depressive mood of Korean workers. We classified the subjects into a total of 4 groups as follows. Group 1: WL and ER status are both “balanced”, group 2: WL status is “imbalanced” and ER status is “balanced”, group 3: WL status is “balanced” and the ER status is “imbalanced”, group 4: WL and ER status are both “imbalanced.”

Results

We found significantly increased odds ratios (ORs) for depressive mood in groups 2, 3, and 4 compared with group 1 after adjusting for the general and occupational characteristics of the subjects in both men and women. We also found that the trend of ORs increased gradually from groups 2 to 4 compared with group 1 in both men and women; group 2: OR: 1.23 (95% confidence interval [CI]: 1.12–1.35), group 3: OR: 1.40 (95% CI: 1.27–1.55), group 4: OR: 1.99 (95% CI: 1.74–2.28) compared with group 1 in men; group 2: OR: 1.28 (95% CI: 1.15–1.42), group 3: OR: 1.45 (95% CI: 1.31–1.59), group 4: OR: 2.04 (95% CI: 1.76–2.36) compared with group 1 in women.

Conclusions

As a result, we found the association between imbalanced WL, ER status, and depressive mood in Korean workers using 2 models simultaneously. It is important to provide a balanced WL and ER condition to improve the mental health of workers.

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Research Article

Combined effect of emotional labor and job insecurity on sleep disturbance among customer service workers: Sunguk Choi, Kwon Ko, Jae Bum Park, Kyung-Jong Lee, Seungho Lee, Inchul Jeong; Ann Occup Environ Med 2020;32:e33. Published online September 10, 2020; DOI: https://doi.org/10.35371/aoem.2020.32.e33

Abstract PDF

Background

Job insecurity and emotional labor are poor job-related factors that are known to cause sleep disturbances in customer service workers. This study investigates the combined effect of emotional labor and job insecurity on sleep disturbance.

Methods

This study used data from the Fifth Korean Working Condition Survey and included 15,147 paid workers who serve customers below 65 years. We re-classified into 6 groups based on whether the degree of emotional labor increased (Rarely/Sometimes/Always) or whether job insecurity (No/Yes) was present. We performed propensity score matching for several covariates and calculated odds ratio (OR) and 95% confidence intervals (CIs) for sleep disturbance by logistic regression models using only matched subjects.

Results

Workers exposed to emotional labor and job insecurity had significantly higher risk for 3 dimensions of sleep disturbance (difficulty falling asleep, waking up repeatedly during the sleep, and waking up with feeling of fatigue) (OR [95% CI]: 1.44 [1.22–1.69], 1.18 [0.99–1.40], 1.52 [1.30–1.79] for emotional labor; and 2.00 [1.75–2.29], 2.20 [1.91–2.53], 1.67 [1.45–1.92] for job insecurity). Compared to those who were exposed to both emotional labor rarely and without job insecurity, when workers had both poor job factors, the OR (95% CI) for sleep disturbance for difficulty falling asleep, waking up repeatedly during the sleep, and waking up with feeling of fatigue were 3.05 (2.42–3.86), 2.89 (2.26–3.69), and 2.60 (2.06–3.29), respectively. The relative excess risk due to Interaction of job insecurity and emotional labor was significant only for difficulty falling asleep, but not the other 2 sleep disturbance dimensions.

Conclusions

Customer service workers suffered from severe sleep disturbances according to the existing degree of emotional labor and job insecurity. The combined effect of both could have an additive influence on serious sleep disturbance among customer service workers.

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Research Article

Association between change in working time arrangements and sleep disturbance: Ryun Ha, Jae Bum Park, Kyung-Jong Lee, Sunguk Choi, Inchul Jeong; Ann Occup Environ Med 2020;32:e18. Published online June 18, 2020; DOI: https://doi.org/10.35371/aoem.2020.32.e18

Abstract PDF Supplementary Material

Background

Change in working time arrangement (WTA) can be harmful to workers' sleep and health. This study aimed to investigate the association between change in working time arrangement and sleep disturbance.

Methods

This study used data from the Fifth Korean Working Condition Survey and included 33,203 paid workers. We performed a stratified analysis by sex. After dividing the participants into 6 groups based on whether or not they experienced WTA changes, and their weekly working hours (≤40, 41–52, ≥53 hours), we calculated odds ratio (OR) using the weekly working hours ≤40 hours and with no WTA change as the reference group.

Results

Of the 33,203 paid workers, participants who experienced change in working time arrangement had higher prevalence of all three types of sleep disturbance symptoms (difficulty in falling asleep, waking up repeatedly during sleep, and waking up with a feeling of exhaustion and fatigue) in both sexes. Compared to the reference group at 95% confidence interval (CI), the group with change in WTA showed elevated OR values of 1.91 (95% CI: 1.73–2.11), 1.93 (95% CI: 1.74–2.14), 2.47 (95% CI: 2.26–2.71) for male workers; and 1.93 (95% CI: 1.73–2.16), 2.02 (95% CI: 1.80–2.27), 2.24 (95% CI: 2.01–2.50) for female workers, for difficulty in falling asleep, waking up repeatedly during the sleep, waking up with a feeling of exhaustion, and fatigue, respectively.

Conclusions

Workers who experience change in work time arrangement show a high risk of sleep disturbance in both sexes.

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Research Article

Association of discrimination and presenteeism with cardiovascular disease: the Fourth Korean Working Conditions Survey: Kyusung Kim, Sung-il Cho, Domyung Paek; Ann Occup Environ Med 2019;31:e28. Published online October 11, 2019; DOI: https://doi.org/10.35371/aoem.2019.31.e28

Abstract PDF Supplementary Material

Background

Discrimination is a representative social determinant of health. Presenteeism is defined as presenting to work despite of illness and is an indicator of group health. We investigated the association of discrimination and presenteeism with cardiovascular disease using Korean data.

Methods

This study used the fourth Korea Working Conditions Survey (2014) data of 27,662 wage workers (employees). Presenteeism and discrimination related to age, sex, education, birth region, and employment type were ascertained. Self-reported cardiovascular disease was also assessed using the survey questionnaire. General and occupational characteristics found to be significant in univariate analyses were entered into a multivariate logistic regression analysis of the association of discrimination and presenteeism with cardiovascular disease. We also calculated the odds ratios of multiple discriminations and/or presenteeism for cardiovascular disease.

Results

In the univariate analyses, sex, age, education, monthly income, employment type, occupation, hours worked per week, workplace scale, and shift work were significantly associated with cardiovascular disease. A multivariate logistic regression analysis adjusted for general and occupational characteristics showed that discrimination and presenteeism were significantly associated with cardiovascular disease. Finally, the association with cardiovascular disease was strongest when both multiple discriminations and presenteeism were present.

Conclusions

Discrimination and presenteeism are associated with cardiovascular disease, and this association was stronger in the presence of multiple types of discrimination and presenteeism.

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Research Article

The association between quality of direct supervisor's behavior and depressive mood in Korean wage workers: the 4th Korean Working Conditions Survey: Cham-Jin Park, Ji-Hoo Yook, Min-Seok Kim, Dongwook Lee, Hyun-Mook Lim, Yun-Chul Hong; Ann Occup Environ Med 2019;31:e16. Published online August 7, 2019; DOI: https://doi.org/10.35371/aoem.2019.31.e16

Abstract PDF Supplementary Material

Background

Workers spend most of their social lives at work and have relationships of varying nature with people in the workplace. Direct supervisors, in particular, have a direct and lasting impact on workers, which may influence workers' mental health. Depression is very prevalent worldwide, and social concern about the disease is on the rise. The aim of this study is to investigate the effect of direct supervisors' behavior on the depressive mood of Korean wage workers.

Methods

We used data from the 4th Korean Working Conditions Survey held in 2014; 22,212 participants were included in the analysis. The quality of a direct supervisor's behavior was categorized from 0 (= lowest) to 5 (= highest) points. The degree of depressive mood was measured on a scale from “normal mood” to “likely depression” based on the 5-item World Health Organization Well-Being Index (WHO-5) questionnaire. Multiple logistic regression was used to analyze the association between the quality of the direct supervisor's behavior and the depressive mood of wage workers.

Results

After multivariable adjustment, significantly increased odds ratio (OR) for likely depression was found in the 4, 3, 2, 1, and 0 points of the quality of the direct supervisor's behavior compared to 5 points. After stratification for the level of satisfaction with working conditions, the OR of the unsatisfied groups was higher than that of the satisfied groups.

Conclusions

Likely depression was found to be significantly associated with a low quality of direct supervisor's behavior. This association was stronger in workers who were not satisfied with their working conditions. This study suggests that proper management of the direct supervisor's behavior is needed to reduce the risk of depression among Korean wage workers.

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International Journal of Environmental Research and Public Health.2021; 18(19): 10330. CrossRef

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Research Article

The association between dependent self-employment and self-reported depression/anxiety and sleep disorder in South Korea: Guyeon Won, Jae Bum Park, Kyung-Jong Lee, Ryun Ha, Seungho Lee, Inchul Jeong; Ann Occup Environ Med 2019;31:e13. Published online July 29, 2019; DOI: https://doi.org/10.35371/aoem.2019.31.e13

Abstract PDF

Background

Dependent self-employment is precarious employment, which can be vulnerable to mental health problems. This study aimed to investigate the association of dependent self-employment with depression, anxiety, and sleep disorder in South Korea.

Methods

This study used data from the Fourth Korean Working Conditions Survey and included 32,691 paid workers. Dependent self-employment and self-reported depression/anxiety, and sleep disorder were investigated using a questionnaire. Logistic regression analysis was performed to investigate the association between dependent self-employment and mental health problems.

Results

Of the 32,691 paid workers, 2,371 (7.3%) were dependent self-employed workers. The odds ratio (OR) of dependent self-employment for self-reported depression/anxiety was 1.78 (95% confidence interval [CI]: 1.29–2.45) and the OR of dependent self-employment for self-reported sleep disorder was 1.26 (95% CI: 1.01–1.59) compared to other paid workers.

Conclusions

Dependent self-employment is related to an increased risk of self-reported depression/anxiety and sleep disorder in South Korea.

Citations

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Mental Health Problems of Self-Employed Workers: A Systematic Review of Potential Moderators
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Sungyo Jung, Yoojin Cho, Jinhyun Kwon, Yeram Yang, Jaewon Lee, Sungkyoon Kim
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Factors Affecting Subjective Well-Being in Workers at Small-Sized Enterprises: A Cross-Sectional Study from the 6th Korean Working Conditions Survey
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Yunjun Park, Wanhyung Lee
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Association between precarious employment and the onset of depressive symptoms in men and women: a 13-year longitudinal analysis in Korea (2009–2022)
Seong-Uk Baek, Jong-Uk Won, Yu-Min Lee, Jin-Ha Yoon
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Research Article

The role of customer service manual on workplace emotional burden in nationwide cross sectional study: Sehyun Yun, Sung-Shil Lim, Jihyun Kim, Young-Kwang Kim, Jong-Uk Won, Jin-Ha Yoon; Ann Occup Environ Med 2019;31:5. Published online February 12, 2019; DOI: https://doi.org/10.1186/s40557-019-0285-9

Abstract PDF

Background

We aim to discuss the overall effect of customer service manual (CSM) on service industry workers using Korean Working Condition Survey.

Methods

Out of 50,007 total survey participants, 11,946 customer service workers were included in the current study (5613 men, 6333 women). Answers to survey questions were used to define the use of CSM, emotional burden, emotional dissonance, engaging angry customers and other covariates. Emotional burden included either depressive event or stress level. Odds ratio (OR) with 95% confidence interval (95% CI) of experiencing emotional burden was calculated by logistic regression model. Interaction effect between CSM and engaging angry customer on emotional burden was also estimated.

Results

Out of 11,946 subjects, total of 3279 (27.4%) have experienced emotional burden. OR (95% CI) of experiencing emotional burden was 1.40 (1.19–1.64) in men and 1.25 (1.09–1.44) in women. There was gender difference in interaction effect between the use of CSM and engaging angry customers. In men, OR (95% CI) was 3.16 (1.38–7.23) with additive effect when always engaging angry customers with CSM compared to rarely engaging without CSM, while in women OR (95% CI) was 8.85 (3.96–19.75) with synergistic effect. Moreover, the risk of depressive event increased only in women with OR (95% CI) 2.22 (1.42–3.48).

Conclusions

Our current study highlighted association between emotional burden and CSM in both men and women service workers. Furthermore, women were affected more severely by CSM. The results from current study suggest that CSM should be changed appropriately to benefit workers.

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Research Article

The association between long working hours and work-related musculoskeletal symptoms of Korean wage workers: data from the fourth Korean working conditions survey (a cross-sectional study): Jae-Gwang Lee, Guang Hwi Kim, Sung Won Jung, Sang Woo Kim, June-Hee Lee, Kyung-Jae Lee; Ann Occup Environ Med 2018;30:67. Published online December 3, 2018; DOI: https://doi.org/10.1186/s40557-018-0278-0

Abstract PDF

Background

It has been reported that long working hours are hazardous to the workers’ health. Especially, work-related musculoskeletal disorders (WMSDs) have been considered as one of the significant health issues in workplace. The objective of this study was to identify the association between long working hours and work-related musculoskeletal symptoms.

Methods

The analysis was conducted using data from the Fourth Korean Working Conditions Survey (KWCS). Subjects of this study were 24,783 wage workers and divided into three groups according to the weekly working hours, which were ≤ 40, 41–52 and > 52 h. The relationship between long working hours and work-related musculoskeletal symptoms was analyzed by multivariate logistic regression method after adjusting for general, occupational characteristics including specific working motions or postures and psychosocial factors.

Results

Approximately 18.4% of subjects worked more than 52 h per week and 26.4 and 16.4% of male subjects and 33.0 and 23.4% of female subjects experienced work-related upper and lower limb pains, respectively, over the last 12 months. Moreover, the prevalence of upper and lower limb pain was increased in both genders as the weekly working hours increased. The odds ratios (ORs) of upper limb pain for those working 41–52 h and more than 52 h per week when adjusted for general, occupational characteristics including specific motions or postures and psychosocial factors were 1.36 and 1.40 for male workers and 1.26 and 1.66 for female workers compared to the reference group, respectively. Furthermore, ORs of lower limb pain for the same weekly working hour groups were 1.26 and 1.47 for male workers and 1.20 and 1.47 for female workers, respectively.

Conclusions

Long working hours were significantly related to work-related musculoskeletal symptoms in Korean wage workers and appropriate interventions should be implemented to reduce long working hours that can negatively affect workers’ health.

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Research Article

Relationship between simultaneous exposure to ergonomic risk factors and work-related lower back pain: a cross-sectional study based on the fourth Korean working conditions survey: Jae-Yeop Kim, Ji-Su Shin, Myeong-Seob Lim, Hyeon-Gyeong Choi, Sung-Kyeong Kim, Hee-Tae Kang, Sang-Baek Koh, Sung-Soo Oh; Ann Occup Environ Med 2018;30:58. Published online September 5, 2018; DOI: https://doi.org/10.1186/s40557-018-0269-1

Abstract PDF

Background

It is well known that ergonomic risk factors and back pain are related. However, few studies have examined the relationship between simultaneous exposure to these risk factors and back pain in a Korean population. We aimed to investigate the relationship between simultaneous exposure to ergonomic risk factors and work-related lower back pain (LBP) based on the fourth Korean Working Conditions Survey (KWCS).

Method

The fourth KWCS (2014) was used for this study. Chi-square tests and logistic regression were used to assess relationship between 5 ergonomic risk factors and work-related LBP. We also analyzed the relationship between simultaneous exposure to 2 risk factors and work-related LBP.

Results

All 5 ergonomic risk factors (fatigue-inducing and painful posture; lifting or moving people; dragging, pushing, or moving heavy objects; standing posture; and repetitive hand or arm movements) were significantly correlated with work-related LBP in the severe exposure group (adjusted odd ratios [aOR] 5.09, 95% confidence interval [CI] 4.46–5.83; aOR 1.98, 95% CI 1.62–2.42; aOR 2.09, 95% CI 1.82–2.40; aOR 1.79, 95% CI 1.60–2.01; aOR 2.04, 95% CI 1.82–2.30, respectively). When exposed to 2 risk factors simultaneously, the relationship between exposure and work-related LBP was not greater than exposure to only 1 risk factor in our study (usually exposed to ‘fatigue-inducing or painful posture’ aOR 2.17, 95% CI 2.02–2.34; high exposure to both ‘fatigue-inducing or painful posture’ and ‘dragging, pushing, or moving heavy objects’ aOR 2.00, 95% CI 1.82–2.20).

Conclusions

There was a strong relationship between severe exposure to each ergonomic risk factor and work-related LBP. However, when exposed to 2 ergonomic risk factors simultaneously, the relationship between exposure and work-related LBP was not stronger than when exposed to only 1 risk factor in our study.

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Research Article

Effect of teacher’s working conditions on voice disorder in Korea: a nationwide survey: Yi-Ryoung Lee, Hyoung-Ryoul Kim, Seyoung Lee; Ann Occup Environ Med 2018;30:43. Published online July 3, 2018; DOI: https://doi.org/10.1186/s40557-018-0254-8

Abstract PDF

Background

Korean teacher’s working conditions are deteriorating. There is concern about the deterioration of teachers’ health and voice disorder is one of the most common problems. Teacher’s vocal health is important for them and their students. The aim of the present study was to investigate working conditions that may affect voice disorders.

Methods

In all, 79 primary and secondary schools were randomly selected for a nationwide school system survey (N = 3345). In 64 schools, 1617 (48.3%) teachers participated via a postal self-report questionnaire from June 2016 to August 2016. After applying inclusion and exclusion criteria, data from 1301 teachers’ were used for analysis. Multiple logistic regression was used to investigate the associations between general, work-related factors, and frequent voice disorders (fVDs) to estimate the adjusted odds ratio(aOR).

Results

Teachers who reported voice symptoms more than once a week (fVD) made up 11.6%. In a multiple logistic regression, fVD was significantly associated with female, difficulty in applying for sick leave as needed, music teachers (primary school), and less than 6 h of sleep per day (primary school). The aOR for fVD was 2.72 (0.83–8.10) in the longest working hours group (> 52 h/wk) among the primary school teachers, and 1.90 (0.80–4.73) in the longest class hour group (≥ 20 h/wk), 1.52 (0.90–2.62) in homeroom teachers among the secondary school teachers, but not statistically significant.

Conclusions

Korean teachers’ working conditions are associated with fVDs. The school health system must take steps to prevent and treat voice disorders of teachers.

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Research Article

The association between Korean employed workers’ on-call work and health problems, injuries: Chulin Baek, Jae Bum Park, Kyungjong Lee, Jaehyuk Jung; Ann Occup Environ Med 2018;30:19. Published online March 20, 2018; DOI: https://doi.org/10.1186/s40557-018-0225-0

Abstract PDF

Background

On-call work is a form of work that requires the person to work at any time during the on-call period. Thus, on-call work is often regarded as one of the most severe stress factors. This study investigates the associations between on-call work and health problems, injuries.

Methods

This study was based on the 3rd Korean Working Conditions Survey. Total of 29,246 employed workers who had been working for at least 1 year were included. Logistic regression analysis was performed to investigate the association between on-call work and health problems, injuries.

Results

The odds ratios for on-call workers in terms of physical health problems, psychological health problems, and injuries were 1.33 (95% confidence interval [CI] 1.22-1.44), 1.31 (95% CI 1.08-1.60), and 2.76 (95% CI 2.26-3.37), respectively. Analysis of the detailed symptoms revealed odds ratios in on-call workers of 2.06 for hearing problems (95% CI 1.63-2.62); 1.71 for skin problems (95% CI 1.38-2.12); 1.22 for back pain (95% CI 1.08-1.38); 1.23 for muscular pains in upper limbs (95% CI 1.12-1.34); 1.27 for muscular pains in lower limbs (95% CI 1.15-1.40); 1.46 for headache, eye fatigue (95% CI 1.32-1.60); 1.37 for abdominal pain (95% CI 1.02-1.85); 1.43 for depression or anxiety disorders (95% CI 1.07-1.93); 1.36 for fatigue (95% CI 1.24-1.49); and 1.41 for insomnia and general sleep difficulties (95% CI 1.13-1.76).

Conclusions

The present study found that on-call work results in an increased risk of health problems and injuries. This study is the result of analyses of broad range of the job spectrum in Korean employed workers; thus, future studies are necessary to determine the effects of on-call work in various job groups.

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Research Article

Association between supervisors’ behavior and wage workers’ job stress in Korea: analysis of the fourth Korean working conditions survey: Shin Uk Kang, Byeong Jin Ye, ByoungGwon Kim, Jung Il Kim, Jung Woo Kim; Ann Occup Environ Med 2017;29:43. Published online October 11, 2017; DOI: https://doi.org/10.1186/s40557-017-0199-3

Abstract PDF

Background

In modern society, many workers are stressed. Supervisors’ support or behavior can affect the emotional or psychological part of the worker. The purpose of this study is to investigate the effect of supervisor’s behavior on worker’s stress.

Methods

The study included 19,272 subjects following the assignment of weighted values to workers other than soldiers using data from the Fourth Korean Working Condition Survey. Supervisors’ behavior was measured using 5 items: “supervisor feedback regarding work,” “respectful attitude,” “good conflict-resolution ability,” “good work-related planning and organizational ability,” and the encouragement of participation in important decision making. Job stress was measured using 1 item: “I experience stress at work.” Multiple logistic regression analysis was performed to examine the effects of supervisors’ behavioral, general, occupational, and psychosocial characteristics on job stress in workers. Organizational characteristics associated with supervisors’ behavior were also analyzed.

Results

The results showed that supervisors’ provision of feedback regarding work increased workers’ job stress (OR = 1.329, 95% CI = 1.203 ~ 1.468). When a supervisor respect workers (OR = 0.812, 95% CI = 0.722 ~ 0.913) or good at planning and organizing works (OR = 0.816, 95% CI: 0.732 ~ 0.910), workers’ job stress decreased. In particular, the two types of supervisor behaviors, other than feedback regarding work, were high in private-sector organizations employing less than 300 employees.

Conclusion

Supervisors’ behavior influenced job stress levels in workers. Therefore, it is necessary to increase education regarding the effects of supervisors’ behavior on job stress, which should initially be provided in private-sector organizations with up to 300 employees.

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Research

The association between perceived discriminations and well-being in Korean employed workers: the 4th Korean working conditions survey: Hee Sung Lee, Guang Hwi Kim, Sung Won Jung, June-Hee Lee, Kyung-Jae Lee, Joo Ja Kim; Ann Occup Environ Med 2017;29:46. Published online October 2, 2017; DOI: https://doi.org/10.1186/s40557-017-0205-9

Abstract PDF

Background

Around the globe, discrimination has emerged as a social issue requiring serious consideration. From the perspective of public health, the impact of discrimination on the health of affected individuals is a subject of great importance. On the other hand, subjective well-being is a key indicator of an individual’s physical, mental, and social health. The present study aims to analyze the relationship between Korean employed workers’ subjective health and their exposure to perceived discrimination.

Methods

The Fourth Korean Working Conditions Survey (KWCS, 2014) was conducted on a representative sample of the economically active population aged 15 years or older, who were either employees or self-employed at the time of interview. After removing inconsistent data, 32,984 employed workers were examined in this study. The data included general and occupational characteristics, perceived discrimination, and well-being. Well-being was measured through the WHO-Five index (1998 version). Multiple logistic regression analysis was used to examine the association between perceived discrimination and well-being.

Result

As a group, employed workers who were exposed to discrimination had a significantly higher likelihood of “poor well-being” than their counterparts who were not exposed to discrimination. More specifically, the workers exposed to age discrimination had an odds ratio(OR) of 1.51 (95% CI: 1.36–1.68), workers exposed to discrimination based on educational attainment had an OR of 1.43 (95% CI: 1.26–1.61), and workers exposed to discrimination based on employment type had an OR of 1.68 (95% CI: 1.48–1.91) with respect to poor well-being.

Furthermore, workers exposed to a greater number of discriminatory incidents were also at a higher risk of “poor well-being” than their counterparts who were exposed to fewer such incidents. More specifically, the workers with three exposures to discrimination had an OR of 2.60 (95% CI: 1.92–3.53), the workers with two such exposures had an OR of 1.69 (95% CI: 1.44–1.99), and the workers with one such exposure had an OR of 1.32 (95% CI: 1.20–1.45).

Conclusion

The present study found that discrimination based on age, educational attainment, or employment type put workers at a higher risk of “poor well-being,” and that the greater the exposure to discrimination, the higher the risk of poor well-being.

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Research Article

Relationship of workplace violence and perpetrators on sleep disturbance-data from the 4th Korean working conditions survey: Taejun Yoo, Byeongjin Ye, Jung-Il Kim, Siwoo Park; Ann Occup Environ Med 2016;28:59. Published online October 19, 2016; DOI: https://doi.org/10.1186/s40557-016-0142-z

Abstract PDF

Objective

The present study analyzed relationship of workplace violence and perpetrators of violence on sleep disturbance among wage workers in Korea.

Methods

The present study used data from the 4th Korean Working Conditions Survey (KWCS) of 2014 in selecting a total of 25,138wage workers as the study population, which excluded those who failed or refused to respond to questions required for the present study. The workplace violence experience group included people who satisfied at least one of six relevant criteria (verbal abuse, unwanted sexual attention, threatening or humiliating behavior, physical violence, bullying/harassment, and sexual harassment) and the group was divided according to whether the perpetrator of violence was a client or colleague. Presence of sleep disturbance was determined based on subjective symptoms felt within the past 12 months by each individual. A multiple logistic regression analysis was performed to identify the effects on sleep distance according to general, occupational, and psychosocial characteristics, as well as the types of workplace violence and perpetrators of violence.

Results

Workplace violence was found as a factor affecting sleep disturbance (OR = 3.773, 95 % CI = 3.058–4.655), and with respect to perpetrators of violence, complaint of sleep disturbance symptoms was higher when the perpetrator was a colleague or boss (OR = 5.688, 95 % CI 4.189–7.723) than a client (OR = 2.992, 95 % CI 2.301–3.890).

Conclusion

Workplace violence had an effect on occurrence of sleep disturbance and when the perpetrators of violence was a boss or colleague at work, the risk for symptoms such as sleep disturbance increased, which indicated the need for appropriate intervention from a workplace healthcare perspective, including preventive education of workplace violence among employees.

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Research Article

Association between employment status and self-rated health: Korean working conditions survey: Kimin Kwon, Jae Bum Park, Kyung-Jong Lee, Yoon-Sik Cho; Ann Occup Environ Med 2016;28:43. Published online September 8, 2016; DOI: https://doi.org/10.1186/s40557-016-0126-z

Abstract PDF

Background

This research was conducted with an aim of determining the association between employment status and self-rated health.

Methods

Using the data from the Third Korean Working Conditions Survey conducted in 2011, We included data from 34,783 respondents, excluding employers, self-employed workers, unpaid family workers, others. Self-rated health was compared according to employment status and a logistic regression analysis was performed.

Results

Among the 34,783 workers, the number of permanent and non-permanent workers was 27,564 (79.2 %) and 7,219 (20.8 %). The risk that the self-rated health of non-permanent workers was poor was 1.20 times higher when both socio-demographic factors, work environment and work hazards were corrected.

Conclusions

In this study, perceived health was found to be worse in the non-permanent workers than permanent workers. Additional research should investigate whether other factors mediate the relationship between employment status and perceived health.

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Research Article

The association between Korean workers’ presenteeism and psychosocial factors within workplaces: Yun-Sik Cho, Jae Bum Park, Kyung-Jong Lee, Kyoung-Bok Min, Chul-In Baek; Ann Occup Environ Med 2016;28:41. Published online September 7, 2016; DOI: https://doi.org/10.1186/s40557-016-0124-1

Abstract PDF

Background

Presenteeism, a concept that has recently undergone active study, is the act of attending work while sick. This study investigates the association between presenteeism and various psychosocial factors within workplaces.

Methods

This study analyzed 29246 wage earners from the third Korean Working Conditions Survey (KWCS, 2011) data using the logistic regression analysis to investigate the association between presenteeism and various psychosocial factors within workplaces.

Results

Among the 29246 wage earners, 6347 (21.7 %) showed presenteeism. Those who experienced age discrimination at work (adjusted odds ratio (aOR) 1.77: 95 % CI 1.56–2.00), educational background discrimination (aOR 1.35: 95 % CI 1.22–1.51), regional discrimination (aOR 1.55: 95 % CI 1.31–1.83), sexual discrimination (aOR 1.65: 95 % CI 1.41–1.94), employment type discrimination (aOR 2.13: 95 % CI 1.89–2.40), physical violence (aOR 1.92: 95 % CI 1.45–2.55), sexual harassment (aOR 2.90: 95 % CI 2.01–4.19), job insecurity (aOR 1.36: 95 % CI 1.18–1.56), work–life imbalance (aOR 1.38: 95 % CI 1.29–1.47), low job satisfaction (aOR 2.04: 95 % CI 1.91–2.17), no colleague support (aOR 1.11: 95 % CI 1.02–1.21), job stress (aOR 1.89: 95 % CI 1.76–2.02), emotional labor (aOR 1.50: 95 % CI 1.41–1.60), high work intensity (aOR 1.31: 95 % CI 1.23–1.38), and 3 groups of job strain that are passive group (aOR 1.09: 95 % CI 1.00–1.18), active group (aOR 1.39: 95 % CI 1.28–1.51), and high strain group (aOR 1.35: 95 % CI 1.24–1.46) showed an increased risk of presenteeism compared to their respective counterparts (p < 0.01).

Conclusions

The study results confirmed the association between presenteeism and various psychosocial factors within workplaces. Considering that presenteeism negatively affects productivity and the mental and physical health of individuals, managing various psychosocial factors within workplaces is proposed to reduce presenteeism.

Citations

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Research Article

Association between night work and cardiovascular diseases: analysis of the 3rd Korean working conditions survey: Sungjin Park, Juhyun Nam, Jong-Ku Lee, Sung-Soo Oh, Hee-Tae Kang, Sang-Baek Koh; Ann Occup Environ Med 2015;27:15. Published online May 11, 2015; DOI: https://doi.org/10.1186/s40557-015-0064-1

Abstract PDF

Objectives

This study was conducted to investigate the relationship between night work and cardiovascular diseases among wage workers in Korea.

Methods

The study was based on the 3rd Korean Working Conditions Survey (KWCS; 2011). This study included 29,711 wage workers. We used the chi-squared test and logistic regression to examine the association between cardiovascular diseases and night work and cumulative night work.

Results

Among all of the paid workers, 12.5% reported doing night work ≥ 1 day per month. Night work was significantly associated with an increased risk of cardiovascular diseases (odds ratio [OR] 1.58, 95% confidence interval [CI] 1.11-2.25). Also, compared to the group that did not do night works, the group with higher cumulative night work demonstrated an increased risk for cardiovascular diseases (OR 1.81, 95% CI 1.19-2.74).

Conclusions

This study suggests that night work is significantly associated with cardiovascular diseases.

Citations

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Research Article

The relationship between working condition factors and well-being: Bum-Joon Lee, Shin-Goo Park, Kyoung-Bok Min, Jin-Young Min, Sang-Hee Hwang, Jong-Han Leem, Hwan-Cheol Kim, Sung-Hwan Jeon, Yong-Seok Heo, So-Hyun Moon; Ann Occup Environ Med 2014;26:34. Published online November 4, 2014; DOI: https://doi.org/10.1186/s40557-014-0034-z

Abstract PDF

Objectives

Working conditions can exert influence on the physical, mental, and even social health of workers. Well-being is an appropriate index for the evaluation of a person’s overall health. This paper investigated the association between various working conditions and worker’s well-being.

Methods

Data from 10,019 interviews were collected from the second wave of the Korean Working Conditions Survey (2010) conducted by the Korea Occupational Safety and Health Agency between June and October 2010. The data from 5,995 employed workers were examined in this study. Well-being was measured through the WHO Five Well-Being Index (1998 version). Sociodemographic and working conditions were analyzed. Adjusted odds ratios for well-being were calculated with adjusted sociodemographic factors, working condition factors, or both.

Results

Workers’ well-being was significantly higher when they were satisfied with their working conditions (OR = 1.656, 95% CI = 1.454–1.885), when their actual working hours were the same as their anticipated working hours (OR = 1.366, 95% CI: 1.120–1.666) or exceeding less than 10 hours (OR = 1.245, 95% CI: 1.004-1.543), and when their employment was stable (OR = 1.269, 95% CI: 1.098–1.467).

Conclusions

This study supports the association between working condition factors and well-being in workers.

Citations

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Research Article

Presenteeism among self-employed workers: Korean working conditions survey: Min-Su Kim, Jae Bum Park, Kyoung-Bok Min, Kyung-Jong Lee, Kimin Kwon; Ann Occup Environ Med 2014;26:32. Published online October 1, 2014; DOI: https://doi.org/10.1186/s40557-014-0032-1

Abstract PDF

Objective

Presenteeism has become a public concern recently. Thus, we aimed to understand the relationship between self-employed workers and presenteeism using a nationally representative sample of Korean workers.

Methods

Using data from the Korean Working Conditions Survey conducted in 2011, a total of 43,392 workers including paid employees and self-employed workers were analyzed. The effect of employment status on presenteeism was analyzed using logistic regression analysis. The independent variables were socioeconomic characteristics, working conditions, and working environments.

Results

Among the 43,392 workers, 34,783 were paid and 8,609 were self-employed. Self-employed workers were more likely to exhibit presenteeism than were paid workers. An elevated odds ratio of 1.27 (95% CI 1.19-1.36) was found for presenteeism among self-employed workers.

Conclusion

Being self-employed was significantly related with exhibiting presenteeism. Additional research should investigate whether other factors mediate the relationship between employment status and presenteeism as well as ways to reduce presenteeism among self-employed workers.

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Yoon Ho Lee, Jeong-Beom Lee, Mid-Eum Moon, Myoung-Je Song, Jong-Sun Kim, Hwa-Young Lee, Eun Chul Jang, Soon-Chan Kwon, Young-Sun Min, In-Ho Lee
Journal of The Korean Society of Living Environmental System.2025; 32(3): 359. CrossRef
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Research Article

Association between Workplace Risk Factor Exposure and Sleep Disturbance: Analysis of the 2nd Korean Working Conditions Survey: Yong-Seok Heo, Sei-Jin Chang, Shin-Goo Park, Jong-Han Leem, Sung-Hwan Jeon, Bum-Joon Lee, Kyung-Yong Rhee, Hwan-Cheol Kim; Ann Occup Environ Med 2013;25:41. Published online December 27, 2013; DOI: https://doi.org/10.1186/2052-4374-25-41

Abstract PDF

Objectives

Sleep is essential for human beings to live and work properly. This study was conducted to investigate the relationship between occupational exposures to workplace risk factors and sleep disturbance in Korean workers.

Methods

The data were drawn from the second Korean Working Conditions Survey (KWCS); a total of 7,112 paid workers were analyzed. The independent variables were occupational exposures such as physical, chemical, biological, and psychosocial risk factor in the workplace, and psychosocial risk factor was divided into five categories (job demand, job control, social support, job insecurity, lack of reward). We estimated the relationship between various occupational exposures and sleep disturbance using multivariate logistic regression analysis.

Results

The results showed that people who exposed to physical, chemical, biological, and psychosocial (high job demand, inadequate social support, lack of reward) risk factors were more likely to increase the risk of sleep disturbance. Furthermore, after adjusting for general and occupational characteristics, we found significant positive associations between exposures to physical (odds ratios [OR] 1.47, 95% confidence interval [CI] 1.05-2.07) and psychosocial (high job demand (OR 2.93, 95% CI 2.16-3.98), inadequate social support (OR 1.57, 95% CI 1.14-2.15), lack of reward (OR 1.45, 95% CI 1.08-1.96)) risk factors and sleep disturbance.

Conclusion

These results suggest that occupational exposures to physical and psychosocial workplace risk factors are significantly related to sleep disturbance.

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Research Article

Long Working Hours and Emotional Well-Being in Korean Manufacturing Industry Employees: Kyoung-Hye Lee, Jong-Eun Kim, Young-Ki Kim, Dong-Mug Kang, Myeong-Ja Yun, Shin-Goo Park, Jae-Seok Song, Sang-Gil Lee; Ann Occup Environ Med 2013;25:38. Published online December 5, 2013; DOI: https://doi.org/10.1186/2052-4374-25-38

Abstract PDF

Objectives

Korea is well known for its long work hours amongst employees. Because workers of the manufacturing industry are constantly exposed to extended work hours, this study was based on how long work hours affect their emotional well-being.

Methods

The analysis was done using the secondary Korean Working Condition Survey (KWCS). Long work hours were defined to be more than 48 hours, and they were subcategorized into units of 52 hours and 60 hours. Based on the WHO (five) well-being index, emotional state was subdivided into three groups - reference group, low-mood group, and possible depression group- where 28 points and 50 points were division points, and two groups were compared at a time. Association between long work hours and emotional state was analyzed using binary and multinomial logistic regression analysis.

Results

Working for extended working hours in the manufacturing industry showed a statistically significant increase (t test p < 0.001) in trend among the possible depression group when compared to the reference group and the low-mood group. When demographical characteristics, health behaviors, socioeconomic state, and work-related characteristics were fixed as controlled variables, as work hours increased the odds ratio of the possible depression group increased compared to the reference group, and especially the odds ratio was 2.73 times increased for work hours between 48–52 and 4.09 times increased for 60 hours or more and both were statistically significant. In comparing the low-mood group and possible depression group, as work hours increased the odds ratio increased to 1.73, 2.39, and 4.16 times, and all work hours from working 48–52 hours, 53–60 hours, and 60 hours or more were statistically significant. Multinomial logistic regression analysis also showed that among the reference group and possible group, the possible depression group was statistically significant as odds ratio increased to 2.94 times in working 53–60 hours, and 4.35 times in 60 hours or more.

Conclusions

Long work hours have an adverse effect on emotional well-being. A more diversified research towards variables that affect long work hours and emotional well-being and how they interact with each other and their relationship to overall health is imperative.

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Research Article

Association between work-related health problems and job insecurity in permanent and temporary employees: Won-Wook Lee, Jae-Bum Park, Kyoung-Bok Min, Kyung-Jong Lee, Min-Su Kim; Ann Occup Environ Med 2013;25:15. Published online September 11, 2013; DOI: https://doi.org/10.1186/2052-4374-25-15

Abstract PDF

Objectives

This research was conducted with an aim of determining the correlation between job insecurity and an employee’s work-related health problems among permanent and temporary workers.

Methods

Using the data from the First Korean Working Conditions Survey conducted in 2006, a total of 7,071 workers, excluding employers and the self-employed, were analyzed. Work-related health problems were categorized as backache, headache, abdominal pain, muscular pain, stress, fatigue, insomnia, anxiety or depression. Each problem was then analyzed for its relationship to job insecurity through logistic regression analysis.

Results

Among the 7,071 workers, 5,294 (74.9%) were permanent workers and 1,777 (25.1%) were temporary workers. For the permanent workers, presence of high or moderate job insecurity appeared more closely linked to backache, headache, abdominal pain, muscular pain, stress, fatigue, insomnia, anxiety, and depression compared to absence of job insecurity. However, for the temporary workers, only depression appeared to be associated with the presence of high job insecurity.

Conclusion

The study showed that the presence of job insecurity is correlated with work-related health problems. The deleterious effects of job insecurity appeared to be stronger in permanent than temporary workers. Additional research should investigate ways to effectively reduce job insecurity.

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Original Article

Risk Factors for Absenteeism due to Work related Musculo-skeletal Disorders among Korean Employees: Sang Gil Lee, Jong Eun Kim, Young Ki Kim, Oh Jun Kwon, Dong Mug Kang; Korean Journal of Occupational and Environmental Medicine 2012;24(3):239-251. Published online September 30, 2012; DOI: https://doi.org/10.35371/kjoem.2012.24.3.239

Abstract PDF

OBJECTIVES
Absenteeism due to musculo-skeletal disorders (MSDs) of workers is an important index of occupational health. Since research on its causes is rare in Korea, the risk factors for absenteeism due to MSDs should be studied.
METHODS
Using the 2nd Korean working condition survey data, we investigated the prevalence of absenteeism due to MSDs. We also analyzed the risk factors for absenteeism by multiple logistic regression analysis in Korean employees.
RESULTS
Prevalence of absenteeism due to MSDs was 0.7% in all employees, 0.5% in men, and 0.9% in women. In logistic regression analysis, gender, age, presence of a representative worker organization, working on tight deadlines, and pace of work dependent on automated equipment/machine were risk factors of absenteeism due to MSDs for both sexes. For males, working time, working at a very high speed were additional risk factors. For females, pace of work dependent on numerical production, performance, and targets were additional risk factors. Although not included in the multiple logistic regression analysis, handling heavy loads in both sexes and average monthly income for women were risk factors in the univariate analysis.
CONCLUSIONS
For absenteeism due to MSDs, the presence of a representative worker organization, along with work pace and its determinants were important risk factors.

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Original Article

The Relationship between Shift Work and Work-related Injuries among Korean Workers: Tae Jun Park, Do Myung Paek, Kee Ock Joh, Jung Sun Park, Sung il Cho; Korean Journal of Occupational and Environmental Medicine 2012;24(1):52-60. Published online March 31, 2012; DOI: https://doi.org/10.35371/kjoem.2012.24.1.52

Abstract PDF

OBJECTIVES
The aim of this study was to evaluate the relationship between shift work and work-related injuries in a representative sample of Korean workers.
METHODS
We used data from the Korean Working Condition Survey of 2006. The participants were 7,075 Korean workers 15 to 64 years of age. Logistic regression was employed to estimate the relationship between shift work and work-related injury using the SAS version 9.2 program.
RESULTS
Shift work was significantly related to work-related injuries compared to non-shift workers(OR 2.40, 95% CI=1.65~3.48). When personal and occupational risk factors were accounted for, shift work had a statistically meaningful relationship with work-related injuries compared to non-shift work(OR 1.79, 95% CI=1.20~2.66).
CONCLUSIONS
In this study, shift workers appear to have a higher risk of work-related injuries compared to non-shift workers. Work-related injuries in shift workers could be attributed to circadian rhythm disorder and sleep problems. Suitable arrangements that ensure flexible working times are needed for shift workers. Further study will be needed to identify and mitigate work-related injuries among shift workers.

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Original Article

The Prevalence of Work Related Sickness Absences According to the Second Korean Working Condition Survey: Ki Hun Hong, Dae Seong Kim, Oh Jun Kwon, Eun A Kim; Korean Journal of Occupational and Environmental Medicine 2011;23(4):428-438. Published online December 31, 2011; DOI: https://doi.org/10.35371/kjoem.2011.23.4.428

Abstract PDF

OBJECTIVES
Worker's health is an important index used to evaluate working conditions and to prioritize prevention policies. However, this index has never before been calculated in Korea. The purpose of this study was to calculate the prevalence of health problems caused by work related sickness absences using the second Korean Working Condition Survey (KWCS) conducted in 2010.
METHODS
The second KWCS was conducted from June to October 2010 as a household survey for employed workers. The work related sickness absence rate was estimated using gender, age, business size, occupational status, level of education, and level of income. A logistic regression was performed in order to evaluate the relationship of the work related sickness absence with general characteristics and work-related conditions.
RESULTS
The rate of work related sickness absence was 1.8(+/-0.2)% for all workers, with 6.0(+/-0.3)% of it being in agriculture, forestry, and fishing, and 2.2(+/-0.5)% in manufacturing. Musculoskeletal disorders (MSD) were the most common work related disorder [1.01(+/-0.12)%], followed by psychiatric disorders [0.18(+/-0.05)%], and respiratory disorders [0.14(+/-0.04)%]. The highest odds ratio (OR) for the work related sickness absence rate was in self-employed workers with employees (OR=2.23, 95%CI=1.05~4.74).
CONCLUSIONS
The work related sickness absence rate for all workers, both self-employed and employed, including agriculture, forestry and fishing workers, and wholesale and retail trade workers was 1.8(+/-0.2)%. Because the KWCS was based on a self-reported questionnaire survey, this figure might be overestimated. In addition, it might omit chronic occupational disease and death cases.

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Journal of Korean Society of Occupational and Environmental Hygiene.2016; 26(1): 64. CrossRef

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Original Article

Relationship between Manufacturing Workers'Job Conditions and Stress: Young A Oh, Myung Sun Lee, Kyung Yong Rhee; Korean Journal of Occupational and Environmental Medicine 2002;14(3):301-314. Published online September 30, 2002; DOI: https://doi.org/10.35371/kjoem.2002.14.3.301

Abstract PDF

OBJECTIVES
In this study we performed an analysis of the stress associated with the working conditions of 6,764 workers based on 'A survey of healthy condition of workers on 1999'by the Korean Occupational Safety and Health Agency. The Purpose of this study was to provide basic data for health education and management for industrial workers'health promotion.
METHODS
Collected data were analyzed using the t-test, ANOVA and multiple regression analysis, using the SPSS 10.0 program.
RESULTS
When the degrees of stress were analyzed according to demographic characteristics, females were found to have higher levels of stress than males (p<0.001). Furthermore, as age was lowered and as the work space became larger, the degrees of a stress were also found to be higher (p<0.001 and p<0.01, respectively). When the degrees of stress were analyzed according to working conditions, longer working hours (p<0.001) and reduced break times (p<0.05), gave rise to higher degrees of stress. Also, as the work space was reduced in size and as the work intensity was augmented, the degrees of a stress were made higher (p<0.01). In terms of physical working conditions, humidity and a lack of sense of security resulted in higher degrees of stress (p<0.01). When the workers sense that their environment is noisy or dusty has poor lighting or ventilation or that the rest room and cafeteria facilities are inadequate, the degrees of stress are found to be higher. As regards the social environment, when the workers sensed that the degree of job demand or job control was higher or that the degree of social support was lower, the degrees of stress were increased (p<0.001). Among those factors which influenced physical stress in the stepwise multiple regression analysis, the primary factor was found to be the safety of the working place (5.1 %). Other factors which influenced physical stress were degree of job demand, age, work intensity, humidity, sexual discrimination, length of working hours, size of work space and the existence or not of a regular break time in this order. Total R2 due to these factors was 12%. Among those factors which influenced mental stress in the stepwise multiple regression analysis, the primary factor was the degree of job demand (4.8 %). Other factors which influenced mental stress were humidity, age, sexual discrimination, the degree of a job control, safety of the working place, degree of social support, a working site, size of the work space, quality of lighting, the existence or not of a regular break time and length of working hours in this order. Total R2 due to these factors was 13.1 %.
CONCLUSIONS
The above results shows that working conditions are strongly related to stress. Furthermore, when both physical and social working conditions are continuously managed and improved, workers may not only reduce their levels of stress but also maximize their working efficiency.

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Original Article

A Survey of Working Conditions of Migrant Workers: Yun Chul Hong, Eun Hee Ha; Korean Journal of Occupational and Environmental Medicine 1996;8(1):1-14. Published online February 29, 1996; DOI: https://doi.org/10.35371/kjoem.1996.8.1.1

Abstract PDF

The number of migrant workers staying in Korea is 73,250 August 1994 now by the data which Economic Planning Agency presented to the National Assembly. Industrial trainees were reported to be 17,640 and illegal stayers were 55,610 but many migrant workers did not seem to be included. There are some reports which described the unfulfillment of their basic right such as discrimination of wage, delay of payment, long working hours, enforced work, but working conditions, work environment and their health were not surveyed well. Therefore this survey is to study their situation such as working conditions, work environment, health and living conditions as well as general characteristics. Questionnaire was written by plain English and was made of closed question mainly. Finally 185 persons completed the questionnaire. The results are as follows; 1) The general characteristics are following: ages are mostly between 20 and 29 years old, and males are more than females, and mostly unmarried. Many were students in their countries and their education levels were high. 2) Many persons; were introduced to Korea by native broker. Total cost for coming to Korea was mostly over $1,000 and many paid over $2,000. Their staying period in Korea is mostly over 2 years arid many persons think their status uneasy. The most important purpose for coming to Korea is to earn money. 3) Many are working in garment factories but most factories are small scale: ones below 20 employees. Most are working over 10 hours a day. The average income is $480 and that is about 54.8% of average income of Korean workers. Unpaid salaries are about $921 per each worker. 4) 15.8% of migrant workers answered to have experienced industrial accidents. Their health status seems to be worse after coming to Korea. The resident environment was very poor. We knew that migrant workers' situation was very bad considering their working conditions, work environment, health and living conditions. Therefore, employment policy of migrant workers must be reviewed immediately and good working conditions must be provided to them as soon as possible.

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Ohwi Kwon, Ji-Hun Song, Jeong-Ok Kong, Seong-Won Ma, Young Shin Lee, Joonho Ahn
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Disability & Society.2011; 26(5): 553. CrossRef

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