Annals of Occupational and Environmental Medicine

Original Article

The relationship between shift work pattern and thyroid stimulating hormone in female workers: Hun Jeong, Chang Ho Chae, Jun Ho Lee, Hyo Won Chong; Ann Occup Environ Med 2023;35:e14. Published online June 22, 2023; DOI: https://doi.org/10.35371/aoem.2023.35.e14

Abstract Abstract in Korean PDF PubReader ePub: Background
Shift work is known to cause changes in the circadian rhythm of the human body and adversely affect not only physical health but also mental health. Some studies have demonstrated the correlation between shift work and thyroid stimulating hormone (TSH), a hormone that changes according to the diurnal rhythm, but few studies have reported the different TSH levels according to the shift work type. This study aimed to investigate changes in TSH according to the shift work type.
Methods
This study included 1,318 female workers who had a medical checkup at a university hospital in Changwon from 2015 to 2019. Shift work types were classified as non-shift work, regular 2 shifts, and irregular three shifts, and a TSH ≥ 4.2 mIU/L was defined as abnormal. A general linear model (GLM) was used to compare the TSH levels and the risk of subclinical hypothyroidism in each year, and a binary logistic analysis was performed using a generalized estimation equation (GEE) to compare the risk of subclinical hypothyroidism over the 5-year period.
Results
Of the 1,318 participants included in this study, 363, 711, and 244 were non-shift, two-shift, and irregular three-shift workers, respectively. In the GEE analysis, after adjusting for age, body mass index, smoking, and alcohol consumption, the odds ratios (ORs) were 1.81 (95% confidence interval [CI]: 1.15–2.86; p = 0.011) in 2 shifts and 2.02 (95% CI: 1.23–3.32; p = 0.006) in irregular three shifts, compared to non-shift.
Conclusions
Our results showed that shift work had a higher risk of subclinical hypothyroidism than non-shift work and that there was a significant difference in the risk of subclinical hypothyroidism according to the shift work type. These findings suggest that the shift work type can be considered in future thyroid function tests and evaluations.; 여성근로자에서 교대근무유형과 갑상선 자극 호르몬과의 연관성
목적
교대근무는 인체의 일중리듬에 변화를 일으키고 심혈관 질환, 소화기 질환 및 대사증후군과 같은 신체적 건강 뿐만 아니라 수면장애, 우울감 등을 포함한 정신건강에도 유해한 영향을 끼치는 것으로 알려져 있다. 일중리듬에 의해 변화하는 호르몬 중 하나인 갑상선 자극 호르몬(TSH)의 농도가 교대근무와의 연관성을 보여주는 연구들이 있으나 교대근무 유형에 따른 차이를 살펴본 연구는 부족한 실정이다. 본 연구는 교대근무의 유형에 따른 TSH의 변화를 알아보고자 하였다.
방법
2015년부터 2019년까지 창원의 일개 대학병원의 건강진단을 받은 1,318명의 여성근로자를 대상으로 연구를 진행하였다. 교대근무유형은 비교대근무, 규칙적 2교대 및 불규칙 3교대로 분류하였으며 TSH ≥ 4.2mIU/L인 경우 이상이 있는 것으로 정의하였다. 연도별로 TSH의 농도를 비교하기 위하여 일반선형모델을 사용하였으며 5년간의 불현성 갑상선기능저하증의 위험도를 비교하기 위하여 일반화추정방정식을 사용하여 이분형 로지스틱 분석을 시행하였다.
결과
연구 대상자 1,318명 중 비교대근무자는 총 363명, 2교대 근무자는 총 711명, 불규칙 3교대 근무자는 총 244명이었다. 연령, 체질량지수(BMI), 흡연, 음주를 보정하고 일반화추정방정식을 사용하여 이분형 로지스틱 분석을 시행한 결과, 비교대근무자를 기준으로 하였을 때, OR은 2교대 근무자에서 1.81(95% CI 1.15-2.86, P=0.011), 불규칙 3교대 근무자에서 2.02(95% CI 1.23-3.32, P=0.006)로 나왔다.
결론
본 연구의 결과는 교대근무가 비교대근무에 비해 불현성 갑상선기능저하증의 위험도가 높았으며 교대근무의 유형에 따른 불현성 갑상선기능저하증의 위험도에 있어 유의미한 차이를 보였다. 이는 이전 연구들의 결과를 뒷받침할 뿐만 아니라 향후 갑상선 기능 검사 및 평가에 있어 교대근무의 유형이 고려대상이 될 수 있을 것으로 생각된다.

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Original Article

Association between coronavirus disease 2019-related workplace interventions and prevalence of depression and anxiety: Hyun Woo Park, Seung Hyun Park, Young Wook Kim, JunSeok Son, Chan Woo Kim, Hyoung Ouk Park, Jun Ho Lee, Young Hoo Shin, Chang Ho Chae, Eui Yup Chung, Hun Jeong; Ann Occup Environ Med 2022;34:e11. Published online June 3, 2022; DOI: https://doi.org/10.35371/aoem.2022.34.e11

Abstract Abstract in Korean PDF Supplementary Material PubReader ePub

Background

Although coronavirus disease 2019 is causing a variety of psychological problems for workers, there are few longitudinal studies on changes in workers’ mental health by workplace intervention. This study aimed to evaluate the change in the prevalence of depression and anxiety according to the active involvement of the workplace.

Methods

This study was conducted on 1,978 workers at a workplace who underwent a health screening from January 2019 to August 2020, and classified depression and anxiety disorders using a self-report questionnaire. After the first pandemic, the company stopped health screening, took paid leave and telecommuting, and conducted interventions such as operating its own screening clinic. To see if this workplace intervention affects workers’ mental health, we conducted generalized estimating equations to compare odds ratio (OR).

Results

In the pre-intervention group, 384 people (16.86%) had depression, and 507 people (22.26%) had anxiety disorder. Based on the OR before intervention, the OR of depression decreased to 0.76 (0.66–0.87) and the OR of anxiety disorder decreased to 0.73 (0.65–0.82).

Conclusions

As a result of this study, it was confirmed that workplace intervention was related to a decrease in depression and anxiety. This study provides basic data to improve workers’ mental health according to workplace intervention, and further research is needed according to workplace intervention in the future.

코로나바이러스감염증-19 관련 사업장 개입과 우울증 및 불안장애 유병률 간의 관련성
목적
COVID-19가 근로자에게 다양한 심리적 문제를 야기하고 있지만, 사업장 개입이 근로자의 정신 건강의 변화에 대한 종단적 연구는 거의 없다. 이 연구는 사업장의 적극적인 개입 여부에 따른 우울, 불안의 유병률 변화를 평가하는 것을 목표로 하였다.
방법
본 연구는 2019년 1월부터 2020년 8월까지 건강검진을 받은 한 사업장의 근로자 1,978명을 대상으로 하였으며, 자기기입식 설문지를 이용하여 우울증, 불안장애를 분류하였다. 이 회사는 1차 대유행 이후 건강검진을 중단하고, 유급휴직 및 재택근무, 자체선별진료소 운영 등의 개입을 실시하였다. 이런 사업장 개입이 근로자의 정신건강에 영향을 미치는지 알아보기 위해 Generalized estimating equation(GEE)을 시행하여 Odds ratio(OR)을 비교하였다.
결과
Pre-intervention group에서 우울증은 총 384명(16.86%)이었으며, 불안장애는 총 507명(22.26%)이었다. Pre-intervention group의 OR를 기준으로 하였을 때, post-intervention group의 우울증 OR는 0.76(0.66-0.87), 불안장애의 OR는 0.73(0.65-0.82)로 감소하였다.
결론
본 연구 결과, 사업장의 개입이 우울, 불안의 감소와 관련이 있다는 것을 확인할 수 있었다. 본 연구는 사업장 개입 여부에 따른 근로자 정신건강을 개선시키기 위한 기초자료를 제공하며, 향후 사업장 개입에 따른 추가 연구가 필요할 것으로 본다.

Citations

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Telecommuting-related health outcomes during the COVID-19 pandemic in South Korea: a national population-based cross-sectional study
Seung-Woo Ryoo, Jin-Young Min, Dong-Wook Lee, Baek-Yong Choi, Juho Choi, Ho-Yeon Kim, Kyoung-Bok Min
BMC Public Health.2023;[Epub] CrossRef
Multidimensional typologies of precarious employment and their relationships with mental well-being in Korean wageworkers: A latent class analysis based on the Korean Working Conditions Survey (2020–2021)
Seong-Uk Baek, Jong-Uk Won, Jin-Ha Yoon
Preventive Medicine.2023; 177: 107787. CrossRef

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Original Article

Distribution of Lung-RADS categories according to job type in a single shipyard workers: Eui Yup Chung, Young Hoo Shin, Young Wook Kim, Jun Seok Son, Chan Woo Kim, Hyoung Ouk Park, Jun Ho Lee, Seung Hyun Park, Sung Joon Woo, Chang Ho Chae; Ann Occup Environ Med 2021;33:e22. Published online June 23, 2021; DOI: https://doi.org/10.35371/aoem.2021.33.e22

Abstract Abstract in Korean PDF PubReader ePub

Background

Recently, lung cancer screenings based on age and smoking history using low-dose computed tomography (LDCT) have begun in Korea. This study aimed to evaluate the distribution of lung imaging reporting and data system (Lung-RADS) categories in shipyard workers exposed to lung carcinogens such as nickel, chromium, and welding fumes according to job type, to provide basic data regarding indications for LDCT in shipyard workers.

Methods

This study included 6,326 workers from a single shipyard, who underwent health examinations with LDCT between January 2010 and December 2018. Data on age, smoking status and history, medical history, and job type were investigated. The participants were categorized into high-exposure, low-exposure, and non-exposure job groups based on the estimated exposure level of nickel, chromium, and welding fumes according to job type. Cox proportional hazard regression analysis was used to determine the difference between exposure groups in Lung-RADS category ≥ 3 (3, 4A, and 4B).

Results

Out of all participants, 97 (1.5%) participants were classified into Lung-RADS category ≥ 3 and 7 (0.1%) participants were confirmed as lung cancer. The positive predictive value (ratio of diagnosed lung cancer cases to Lung-RADS category ≥ 3) was 7.2%. The hazard ratio (HR) of Lung-RADS category ≥ 3 was 1.451 (95% confidence interval [CI]: 0.911–2.309) in low-exposure and 1.692 (95% CI: 1.007–2.843) in high-exposure job group. Adjusting for age and pack-years, the HR was statistically significant only in the high-exposure job group (HR: 1.689; 95% CI: 1.004–2.841).

Conclusions

Based on LDCT and Lung-RADS, among male shipyard workers, Lung-RADS category ≥ 3 were significantly higher in the high-exposure job group. Their HR tended to be > 1.0 and was statistically significant in the high-exposure job group. Additional studies should be conducted to establish more elaborate LDCT indications for occupational health examination.

일개 조선소 근로자의 직종간 Lung-RADS 비교
목적
최근 폐암의 조기 발견을 위해 저선량 흉부CT (LDCT)를 이용하기 시작했으며, 국내에서도 연령과 흡연력을 기준으로 한 국가폐암검진이 시작되었다. 니켈, 크롬, 용접흄은 조선소 근로자에서 흔히 노출될 수 있는 폐암 발암물질로 알려져 있으나, 이러한 위험 요인은 아직 폐암 검진의 기준이 되지 못하였다. 이 연구는 LDCT를 이용하여 니켈, 크롬, 용접흄에 노출되는 일개 조선소 근로자들에서 직종과 폐 CT 선별 판독 시스템 (Lung-RADS) 양상을 비교하여, 조선소 근로자의 LDCT 적응증에 대한 기초 자료를 생성하고자 하였다.
방법
2010년 1월부터 2018년 12월까지 건강검진에 참여한 경남지역 조선소 근로자 6,326명이 연구에 참여했다. 문진과 자기기입식 설문지를 이용하여 연령, 흡연력, 과거력, 직종 등을 확인하여, 직군에 따른 크롬, 니켈, 용접흄의 노출 추정 정도에 따라 고노출 직군, 저노출 직군, 비노출군으로 분류하였다. 그룹 간 Lung-RADS 3 이상인 군에 차이가 있는지 cox 비례위험 회귀분석을 시행하였다. 또한 연령과 갑년을 보정하여 그룹간 hazard ratio (HR)를 비교하였다.
결과
전체 대상자 6,326명 중 Lung-RADS 3 이상인 군은 97명, 폐암으로 확진된 대상자는 7명으로, 양성예측도 (PPV)는 7.2%이였다. Lung-RADS 3 이상에 대하여 직군에 따른 HR은 저노출 직군 1.451 (95% confidence interval [CI]: 0.911-2.309), 고노출 직군 1.692 (95% CI: 1.007-2.843)으로 나타났다. 연령과 갑년을 보정했을 시 HR은 고노출 직군에서만 유의하게 1.689 (95% CI: 1.004-2.841)로 나타났다.
결론
현행의 폐암검진 방법인 LDCT와 진단기준인 Lung-RADS를 이용하였을 때, 일개 조선소 남성 근로자 중 니켈, 크롬, 용접흄 노출 직군에서 Lung-RADS 3 이상군이 유의하게 많으며, HR이 1.0보다 높은 경향을 보이고, 고노출 직군에서는 유의한 결과를 보였다. 향후 추가적인 연구를 통해 보다 정밀한 근로자 건강검진 상 LDCT 적응증을 만들어야 한다.

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Artificial intelligence-based graded training of pulmonary nodules for junior radiology residents and medical imaging students
Xiaohong Lyu, Liang Dong, Zhongkai Fan, Yu Sun, Xianglin Zhang, Ning Liu, Dongdong Wang
BMC Medical Education.2024;[Epub] CrossRef
The effect of occupational exposure to welding fumes on trachea, bronchus and lung cancer: A systematic review and meta-analysis from the WHO/ILO Joint Estimates of the Work-related Burden of Disease and Injury
Dana Loomis, Angel M. Dzhambov, Natalie C. Momen, Nicholas Chartres, Alexis Descatha, Neela Guha, Seong-Kyu Kang, Alberto Modenese, Rebecca L. Morgan, Seoyeon Ahn, Martha S. Martínez-Silveira, Siyu Zhang, Frank Pega
Environment International.2022; 170: 107565. CrossRef

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Research Article

The effect of shift work on high sensitivity C-reactive protein level among female workers: Ho Sung Kwak, Hyoung Ouk Park, Young Ouk Kim, Jun Seok Son, Chan Woo Kim, Jun Ho Lee, Young Hoo Shin, Seung Hyun Park, Eui Yup Chung, Chang Ho Chae; Ann Occup Environ Med 2019;31:e5. Published online May 28, 2019; DOI: https://doi.org/10.35371/aoem.2019.31.e5

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Background

This study assessed the association between shift work and high-sensitivity C-reactive protein (hs-CRP) level, a risk factor for cardiovascular disease (CVD), in female workers in electronics manufacturing services (EMS).

Methods

Female EMS workers who received special medical examinations for workers in Gyeongnam, Korea between January 2017 and December 2017 were enrolled in this study. Their age, marital status, education level, alcohol consumption, smoking habit, regular exercise, quality of sleep, work stress, and depression were investigated, and blood tests were conducted. The t- and χ² tests were conducted to compare the general and biochemical characteristics between daytime and shift worker groups. Age-adjusted partial correlation analysis was performed to examine the linear relationship between hs-CRP level and other risk factors for CVDs. In addition, the difference in hs-CRP levels according to work schedule was analyzed by ANCOVA after adjusting for variables that could affect the hs-CRP level.

Results

Although the average hs-CRP levels did not differ significantly between daytime and shift workers (0.92 ± 1.87 and 1.07 ± 2.20 mg/dL, respectively), shift workers tended to show a higher hs-CRP level (p = 0.067). After adjusting for variables that can affect the hs-CRP level, the estimated average hs-CRP level was significantly higher in shift workers (1.325 ± 0.156 mg/dL) than that in daytime workers (0.652 ± 0.350 mg/dL) (p = 0.003).

Conclusions

The results of this study identified a relationship between shift work and hs-CRP level increase in women. Because multiple studies have reported associations between increased hs-CRP and CVD, follow-up of hs-CRP may help early detection of CVD in shift workers.

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Associations between circadian disruption and cardiometabolic disease risk: A review
Velarie Ansu Baidoo, Kristen L. Knutson
Obesity.2023; 31(3): 615. CrossRef
Sleep Irregularity and Subclinical Markers of Cardiovascular Disease: The Multi‐Ethnic Study of Atherosclerosis
Kelsie M. Full, Tianyi Huang, Neomi A. Shah, Matthew A. Allison, Erin D. Michos, Daniel A. Duprez, Susan Redline, Pamela L. Lutsey
Journal of the American Heart Association.2023;[Epub] CrossRef
Consequences of Shift Work and Night Work: A Literature Review
Isabel Silva, Daniela Costa
Healthcare.2023; 11(10): 1410. CrossRef
Exposure to Radiation During Work Shifts and Working at Night Act as Occupational Stressors Alter Redox and Inflammatory Markers
Sanaa A. El-Benhawy, Rasha A. El-Tahan, Sameh F. Nakhla
Archives of Medical Research.2021; 52(1): 76. CrossRef
Analysis of the relationship between the level of high-sensitive C-reactive protein and the risk factors of cardiovascular diseases in young and middle-aged persons
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Helena C. Kaltenegger, Linda Becker, Nicolas Rohleder, Dennis Nowak, Matthias Weigl
Systematic Reviews.2020;[Epub] CrossRef

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Research Article

Comparison of risk-assessment tools for cardio-cerebrovascular diseases (CVD) in male shipyard workers: a cross-sectional study: Jea Chul Ha, Jun Seok Son, Young Ouk Kim, Chang Ho Chae, Chan Woo Kim, Hyoung Ouk Park, Jun Ho Lee, Young Hoo Shin, Hyun Woo Park; Ann Occup Environ Med 2019;31:e4. Published online May 23, 2019; DOI: https://doi.org/10.35371/aoem.2019.31.e4

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Background

Periodic revision of assessment tools is essential to ensure risk assessment reliability and validity. Despite the recent revision of the Korea Occupational Safety and Health Agency (KOSHA) 2018, there is no evidence showing that the revision is superior to other cardio-cerebrovascular diseases (CVDs) risk-assessment tools for workplace health management. We conducted a comparative analysis using the Framingham risk score (FRS) as a gold standard to identify the most relevant CVDs risk-assessment tool for workplace health management.

Methods

We included 4,460 shipyard workers who had undergone a workers' health examination during January–December 2016. Risk levels for CVDs were calculated based on the FRS, KOSHA 2013, KOSHA 2017, KOSHA 2018 (2 methods), National Health Screening Program health risk appraisal (NHS HRA) 2017, and NHS HRA 2018. Study participants were categorized into low-risk, moderate-risk, or high-risk groups. Sensitivity, specificity, correlation, and agreement of each risk-assessment tool were calculated compared with the FRS as a gold standard. For statistical analyses, Spearman's rank correlation coefficient and the linearly weighted kappa coefficient were calculated.

Results

Sensitivity of the risk assessments was highest in the KOSHA 2018 (health risk appraisal [HRA]). The FRS showed correlation coefficients of 0.354 with the KOSHA 2013, 0.396 with the KOSHA 2017, 0.386 with the KOSHA 2018, 0.505 with the KOSHA 2018 (HRA), 0.288 with the NHS HRA 2017, and 0.622 with the NHS HRA 2018. Kappa values, calculated to examine the agreement in relation to the KOSHA 2013, KOSHA 2017, KOSHA 2018, KOSHA 2018 (HRA), NHS HRA 2017, and NHS HRA 2018 with the FRS, were 0.268, 0.322, 0.352, 0.136, 0.221, and 0.559, respectively.

Conclusions

The NHS HRA 2018 risk calculation method is a useful risk-assessment tool for CVDs, but only when appropriate classification criteria are applied. In order to enhance the risk-group identification capability of the KOSHA guideline, we propose to apply the classification criteria set in this study based on the risk group definition of the 2018 Korean Society of Hypertension guidelines for the management of hypertension instead of the current classification criteria of the KOSHA 2018.

Citations

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Comparing Korea Occupational Safety & Health Agency and National Health Insurance Service’s cardio-cerebrovascular diseases risk-assessment tools using data from one hospital’s health checkups
Yunrae Cho, Dong Geon Kim, Byung-Chan Park, Seonhee Yang, Sang Kyu Kim
Annals of Occupational and Environmental Medicine.2023;[Epub] CrossRef
Usefulness of Relative Handgrip Strength as a Simple Indicator of Cardiovascular Risk in Middle-Aged Koreans
Won Bin Kim, Jun-Bean Park, Yong-Jin Kim
The American Journal of the Medical Sciences.2021; 362(5): 486. CrossRef

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Research Article

Changes of depression and job stress in workers after merger without downsizing: Jun Ick Jung, Jun Seok Son, Young Ouk Kim, Chang Ho Chae, Chan Woo Kim, Hyoung Ouk Park, Jun Ho Lee, Young Hoo Shin, Jea Chul Ha; Ann Occup Environ Med 2018;30:54. Published online August 29, 2018; DOI: https://doi.org/10.1186/s40557-018-0266-4

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Background

Since the 1980s, restructuring, which includes downsizing, closures, mergers, and privatization, has expanded worldwide, and various studies have investigated its effect on health. However, previous studies have mainly focused on restructuring accompanied by massive lay-offs, and the effect of a merger on workers’ health is still controversial. This study aims to investigate changes in worker depression and job stress after a merger without downsizing, which is unusual in Korea.

Methods

Repeated surveys were done in April 2014, April 2015, and April 2016 involving the participation of 209 subjects. Participants were divided into two groups, which were comprised of blue-collar workers (104) and white-collar workers (105). Sociodemographic characteristics, including age, education level, job tenure, gender, marital status, smoking status, and alcohol consumption, were measured via a survey. To determine the level of depression, the Korean version of the Center for Epidemiologic Studies Depression Scale (CES-D) was employed, and to investigate job stress, the Korean Occupational Stress Scale-Short Form (KOSS-SF) was used. For statistical analyses, Pearson’s chi-square test, the Student’s t-test, and repeated measure analysis of variance (ANOVA) were performed.

Results

The results showed that depression (CES-D, F[2, 400] = 0.466, p = 0.628) was changed but without significance and job stress (KOSS-SF, F[1.899, 379.831] = 3.192, p = 0.045) were significantly different. The between-group difference in the CES-D score between the blue- and white-collar workers by survey administration time was not statistically significant (F = 0.316, p = 0.574). The interaction between the survey time and occupational group was also not statistically significant (F = 0.967, p = 0.381). The between-group difference in the KOSS-SF total score was not statistically significant (F = 1.132, p = 0.289), and the interaction between the survey administration time and occupational group was also not significant (F = 0.817, p = 0.437). In the job stress subgroup analyses Job insecurity and Lack of reward showed a significant difference by survey administration time.

Conclusion

This study showed that a merger without massive downsizing can cause negative health effects such as an changes in depression and increase in job stress. To improve the health of workers, both the immediate negative effects on health, and the long-term effects or their resolution over time should be considered prior to the merger.

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A Review of Psychological Stress among Students and Its Assessment Using Salivary Biomarkers
Bruno Špiljak, Maja Vilibić, Ana Glavina, Marija Crnković, Ana Šešerko, Liborija Lugović-Mihić
Behavioral Sciences.2022; 12(10): 400. CrossRef

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Research Article

The relationship between serum vitamin D levels and sleep quality in fixed day indoor field workers in the electronics manufacturing industry in Korea: Young Saeng Jung, Chang Ho Chae, Young Ouk Kim, Jun Seok Son, Chan Woo Kim, Hyoung Ouk Park, Jun Ho Lee, Young Hoo Shin, Ho Sung Kwak; Ann Occup Environ Med 2017;29:25. Published online June 24, 2017; DOI: https://doi.org/10.1186/s40557-017-0187-7

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Background

Although recent studies have investigated the influence of vitamin D on sleep patterns, there is a lack of research on the relationship between vitamin D and sleep patterns in Korean workers. This study focused on the relationship between serum vitamin D levels and sleep in fixed day indoor field workers in the electronics manufacturing industry in Korea.

Methods

The 1472 subjects who were included in this study were selected from fixed day workers in the electronics manufacturing industry who had received a worker’s special health examination at a hospital in Changwon, South Gyeongsang Province between January 2015 and December 2015. Nighttime workers and those who showed symptoms of depression were excluded from this study. The sociodemographic and lifestyle variables of the participants were investigated, including age, sex, marital status, level of education, body mass index, smoking habits, alcohol consumption habits, and regular exercise. Work-related factors were evaluated, such as employee tenure and occupational stress. Serum 25-hydroxyvitamin D was measured as an indicator of vitamin D levels, and quality of sleep was evaluated using the Pittsburgh Sleep Quality Index (PSQI) translated into Korean.

Results

The subjects had a mean serum vitamin D level of 13.70 ± 5.93 ng/mL. Vitamin D deficiency, defined as a serum vitamin D level of <10 ng/mL, was found in 24.8% of males and significantly more frequently in females (47.6%). Poor sleep quality was reported by 19.8% of participants with serum vitamin D levels ≥10 ng/mL and by 21.7% of those with serum vitamin D levels <10 ng/mL, which was a significant difference (P = .007). Multiple logistic regression analysis adjusting for significant variables found that poor sleep quality was more likely in those with vitamin D deficiency than those with higher serum vitamin D levels (odds ratio = 1.36; 95% CI, 1.01–1.82). A comparison of serum vitamin D levels and PSQI components showed that the mean scores for subjective sleep quality, sleep latency, and sleep duration were significantly higher in the vitamin D-deficient participants, indicating that the vitamin D-deficient participants had poorer sleep quality.

Conclusions

This study investigated serum vitamin D levels in fixed day indoor field workers in the manufacturing industry in Korea and analyzed the relationship of vitamin D deficiency with sleep quality. A significant correlation was found between serum vitamin D deficiency and poor sleep quality. Based on the results of this study, sleep disorder management for workers can be improved by providing regular examinations checking their serum vitamin D levels and supplying vitamin D to workers with serum vitamin D deficiency to enhance their quality of sleep.

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Erratum

Erratum to: The relationship between quality of sleep and night shift rotation interval: Jae Youn Kim, Chang Ho Chae, Young Ouk Kim, Jun Seok Son, Ja Hyun Kim, Chan Woo Kim, Hyoung Ouk Park, Jun Ho Lee, Soon Kwon; Ann Occup Environ Med 2016;28:6. Published online January 25, 2016; DOI: https://doi.org/10.1186/s40557-016-0090-7

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Research Article

The relationship between quality of sleep and night shift rotation interval: Jae Youn Kim, Chang Ho Chae, Young Ouk Kim, Jun Seok Son, Ja Hyun Kim, Chan Woo Kim, Hyoung Ouk Park, Jun Ho Lee, Sun Il Kwon; Ann Occup Environ Med 2015;27:31. Published online December 17, 2015; DOI: https://doi.org/10.1186/s40557-015-0084-x

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Background

Shift work is closely related with workers' health. In particular, sleep is thought to be affected by shift work. In addition, shift work has been reported to be associated with the type or direction of shift rotation, number of consecutive night shifts, and number of off-duty days. We aimed to analyze the association between the night shift rotation interval and the quality of sleep reported by Korean female shift workers.

Methods

In total, 2,818 female shift workers from the manufacturing industry who received an employee physical examination at a single university hospital from January to August in 2014 were included. Subjects were classified into three groups (A, B, and C) by their night shift rotation interval. The quality of sleep was measured using the Korean version of the Pittsburgh Sleep Quality Index (PSQI). Descriptive analysis, univariate logistic regression, and multivariate logistic regression were performed.

Results

With group A as the reference, the odds ratio (OR) for having a seriously low quality of sleep was 1.456 (95% CI 1.171–1.811) and 2.348 (95% CI 1.852–2.977) for groups B and C, respectively. Thus, group C with the shortest night shift rotation interval was most likely to have a low quality of sleep. After adjustment for age, obesity, smoking status, alcohol consumption, exercise, being allowed to sleep during night shifts, work experience, and shift work experience, groups B and C had ORs of 1.419 (95% CI 1.134–1.777) and 2.238 (95% CI 1.737–2.882), respectively, compared to group A.

Conclusion

Our data suggest that a shorter night shift rotation interval does not provide enough recovery time to adjust the circadian rhythm, resulting in a low quality of sleep. Because shift work is influenced by many different factors, future studies should aim to determine the most optimal shift work model and collect accurate, prospective data.

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Chuanfeng Liu, Yuzhao Liu, Yu Xin, Yangang Wang
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Kampanat Wangsan, Naesinee Chaiear, Kittisak Sawanyawisuth, Piyanee Klainin-Yobas, Kanjana Simajareuk, Watchara Boonsawat
International Journal of Environmental Research and Public Health.2022; 19(21): 13986. CrossRef
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Qiao Huang, Chong Tian, Xian-Tao Zeng
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Erratum to: The relationship between quality of sleep and night shift rotation interval
Jae Youn Kim, Chang Ho Chae, Young Ouk Kim, Jun Seok Son, Ja Hyun Kim, Chan Woo Kim, Hyoung Ouk Park, Jun Ho Lee, Soon Il Kwon
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Research Article

Association between serum vitamin D and depressive symptoms among female workers in the manufacturing industry: Soon Il Kwon, Jun Seok Son, Young Ouk Kim, Chang Ho Chae, Ja Hyun Kim, Chan Woo Kim, Hyoung Ouk Park, Jun Ho Lee, Jun Ick Jung; Ann Occup Environ Med 2015;27:28. Published online December 12, 2015; DOI: https://doi.org/10.1186/s40557-015-0083-y

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Background

Vitamin D has been known to maintain the body’s balance of calcium and phosphorus as well as skeletal health. There has been increasing emphasis on the importance of vitamin D as recent studies have been reporting the specific functions of vitamin D in the cerebral nervous system and the association between the level of serum vitamin D and depressive symptoms. However, there is currently a paucity of research investigating the association between serum vitamin D and depressive symptoms in Korean subjects. Consequently, this study has aimed to determine the level of serum vitamin D and explore the association between serum vitamin D and depressive symptoms in Korean female workers.

Method

A medical examination, questionnaire, anthropometric measurements, and a blood test were conducted between February 3 and March 7, 2014 in 1054 subjects among female workers in the manufacturing industry who underwent physical examinations in a university hospital. From this data, we identified the level of serum vitamin D and investigated the association between serum vitamin D deficiency and depressive symptoms.

Results

The average serum vitamin D level of the 1054 subjects was 9.07 ± 3.25 ng/mL, and the number of subjects in the serum vitamin D deficiency group with less than 10 ng/mL was 721 (68.4 %). The odds ratio of the depressive symptom group with a CES-D score of 16 or above being in the deficiency group with a serum vitamin D level less than 10 ng/mL was found to be 1.55 (95 % CI = 1.15–2.07).

Conclusion

68.4 % of female workers in the manufacturing industry were in the deficiency group with serum vitamin D levels less than 10 ng/mL. Additionally, we identified an association between serum vitamin D deficiency and depressive symptoms. In the future, if serum vitamin D deficiency is checked regularly in workers, we expect to achieve better outcomes in managing their depressive symptoms.

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Vitamin D and Metabolic Syndrome in Working Age Subjects from an Obesity Clinic
Luisella Vigna, Michela Carola Speciani, Amedea Silvia Tirelli, Francesca Bravi, Carlo La Vecchia, Caterina Conte, Francesca Gori
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Research Article

Anxiety symptoms and occupational stress among young Korean female manufacturing workers: Kang Ho Lee, Chang Ho Chae, Young Ouk Kim, Jun Seok Son, Ja-Hyun Kim, Chan Woo Kim, Hyoung Ouk Park, Jun Ho Lee, Young Saeng Jung; Ann Occup Environ Med 2015;27:24. Published online November 14, 2015; DOI: https://doi.org/10.1186/s40557-015-0075-y

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Background

The prevalence of anxiety disorders has been increasing in South Korea, with recent studies reporting anxiety disorders as the most common mental disorder among all South Korean females. Anxiety disorders, which are independent risk factors of suicidal ideation and suicide attempts, are significantly correlated with productivity loss, high medical costs, impaired work performance, and frequent worker absence, and thus are potentially serious problems affecting the health of South Korean female workers. In previous studies, anxiety disorders were shown to have a significant correlation with occupational stress. This study seeks to examine the prevalence of anxiety symptoms as well as the relationship between occupational stress and anxiety symptoms among South Korean female manufacturing workers.

Methods

A structured self-reported questionnaire was administered to 1,141 female workers at an electrical appliance manufacturing plant. The questionnaire collected data on general characteristics, health behaviors, sleep quality, job characteristics (shift work, shift work schedule, and job tenure), occupational stress, and anxiety symptoms. Sleep quality was measured using the Pittsburgh Sleep Quality Index, occupational stress with the Korean Occupational Stress Scale-Short Form (KOSS-SF), and anxiety symptoms with the Korean version of the Beck Anxiety Inventory. A chi square test was conducted to determine the distribution differences in anxiety symptoms based on general characteristics, health behaviors, job characteristics, and sleep quality. A linear-by-linear association test was used to determine the distribution differences between anxietysymptoms and the levels of occupational stress. Last, logistic regression analysis was used in order to determine the association between occupational stress and anxiety symptoms.

Results

The prevalence of anxiety symptoms was 15.2 %. In the multivariate logistic regression analysis that adjusted for sleep quality and general characteristics, a significantassociation was found for those with anxiety disorders; the odds ratios (OR) were significantly higher the greater the total KOSS-SF score (moderate-risk group OR=2.85, 95 % CI=1.79–4.56; high-risk group OR=5.34, 95 % CI=3.59–7.96). In addition, excluding insufficient job control, all other KOSS-SF subscales were significantly associated with anxiety symptoms, and a relatively high OR was seen in the high-risk group for job demand (OR=3.19, 95 % CI=2.27–4.49), job insecurity (OR=4.52, 95 % CI=2.86–7.13), and occupational culture (OR=4.52, 95 % CI=2.90–7.04).

Conclusion

There was a significant association between anxiety symptoms and occupational stress stemming from the psychosocial work environment among these South Korean female manufacturing workers. Future longitudinal studies are needed to examine the association between the occupational stress caused by the psychosocial work environment and the incidence of anxiety disorders and anxiety symptoms. Furthermore, intervention programs that aim to address the prevalence of anxiety symptoms and improve the psychosocial work environment, especially for younger female manufacturing workers, are needed.

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Case Report

A Case of Lead Poisoning by Ingesting Herbal Pills Tainted by Lead during the Manufacturing Process: Young Hoo Shin, Jun Seok Son, Young Wook Kim, Chang Ho Chae, Ja Hyeon Kim, Chan Woo Kim, Jun Ho Lee; Korean Journal of Occupational and Environmental Medicine 2010;22(3):271-277. Published online September 30, 2010; DOI: https://doi.org/10.35371/kjoem.2010.22.3.271

Abstract PDF

BACKGROUND
This is a case report of lead poisoning after herbal pill ingestion. We report this case here as a reminder that contamination during the manufacturing process is an important issue regarding herbal pills. Case Report: A 37-year-old male was admitted to the hospital with abdominal pain caused by cholecystitis. He was transferred to the Department of Occupational and Environmental Medicine on 26 December 2008, because of anemia. On follow-up examination post cholecystectomy, the patient had increasing blood lead levels. There was no specific finding in his medical history, but he had been taking herbal pills for 3 months to treat dyspepsia. We performed an analysis on the herbal pills, and determined a lead concentration of 1485 mg/kg. When he was admitted to the hospital, the patient had a blood lead level of 84.13 microgram/dL and a zinc protoporphyrin level was 230 microgram/dL. The patient was treated with 250 mg of Penicillamine, 4 times per day. During follow-up 3 weeks later, the patient's blood lead level had been reduced to 36.52 microgram/dL which allowed us to take him off of Penicillamine. By 7 months follow-up, the patient's blood lead concentration had fallen from 36.52 microgram/dL to 20.93 microgram/dL.
CONCLUSION
Lead poisoning was confirmed by analyzing blood lead levels and the cause was herbal pills. Upon analysis of the herbal pills, we have discovered that the herbal pills contained an amount of lead acquired during the manufacturing process, based on the high levels of this heavy metal in comparison to other metals. Private herbal pill manufacturing plants need systematic management and oversight.

Citations

Citations to this article as recorded by

Collective exposure to lead from an approved natural product-derived drug in Korea
Dae-Young Lim, Won-Yang Kang, Ji-Sung Ahn, Seunghyeon Cho, Suwhan Kim, Jai-Dong Moon, Byung-Chan Lee, Won-Ju Park
Annals of Occupational and Environmental Medicine.2019;[Epub] CrossRef
Monitoring of Heavy Metal Contents in Commercial Herbal Medicines in Korea: Cultivated Herbal Medicines in the Seoul and Daegu Areas
Seol Jang, Ah-Reum Lee, A-Eong Lee, Go-Ya Choi, Ho-Kyoung Kim
Korean Journal of Environmental Health Sciences.2015; 41(1): 30. CrossRef

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