Annals of Occupational and Environmental Medicine

Original Article

Impact of neck posture and insulating stick use on neck disability in Korean line workers: a cross-sectional study: Bounggyun Ju, Jaehoo Lee, Hye-min Kim, Chul Gab Lee, Hansoo Song; Ann Occup Environ Med 2024;36:e11. Published online April 15, 2024; DOI: https://doi.org/10.35371/aoem.2024.36.e11

Abstract Abstract in Korean PDF Supplementary Material PubReader ePub

Background

Occupational neck disability is a prevalent issue, especially among line workers, who are often exposed to elevated levels of cervical ergonomic stress. The aim of this study was to investigate the impact of neck posture and insulating stick use on neck disability in a specific occupational group in Korea.

Methods

This cross-sectional study was conducted among 483 line workers in Gwangju and Jeonnam, Korea. Data were collected using the Neck Disability Index, Cervical Degenerative Index, and a structured questionnaire focusing on demographic and occupational factors. Logistic regression analysis was applied to determine the adjusted odds ratio (OR) and 95% confidence interval (CI) for neck posture and factors related to neck disability.

Results

Neck disability prevalence was 17.2% among the participants. Multivariate logistic regression analysis showed that factors related to neck disability included age over 60 years (adjusted OR: 3.08; 95% CI: 1.63–5.83), depression (adjusted OR: 8.33; 95% CI: 3.85–18.00), a history of cervical trauma (adjusted OR: 2.13; 95% CI: 1.04–4.40), and radiological degenerative changes in the cervical spine (adjusted OR: 2.33; 95% CI: 1.26–4.33). In particular, the adjusted OR of neck disability among live-line workers was 2.10 (95% CI: 1.12–3.92) when compared with support workers (model 1). Other analysis models showed that use of insulating sticks for more than 10 hours per week (adjusted OR: 2.46; 95% CI: 1.32–4.61) and higher neck extension (adjusted OR: 2.98; 95% CI: 1.14–3.46) were significant work-related risk factors (model 2,3).

Conclusions

Neck posture, age, depression, cervical trauma history, degenerative changes in the cervical spine, and use of insulating sticks are significant risk factors for neck disability among line workers in Korea. These findings highlight the need to improve the working environment and reduce the burden of cervical ergonomic stress among line workers.

한국 배전보수원의 목 부담자세와 절연스틱사용이 목 장애에 미치는 영향
목적
직업성 목 장애는 특히 높은 수준의 목 부담에 자주 노출되는 배전보수원 사이에서 흔한 문제다. 본 연구는 배전보수원을 대상으로 목 부담자세와 절연스틱사 용이 목 장애에 미치는 영향을 알아보고자 한다.
방법
본 단면연구는 광주와 전남 지역의 배전보수원 483명을 대상으로 실시되었다. 목 장애 지수, 경추퇴행성 지수, 인구통계학적 및 직업적 요인에 초점을 맞춘 구조화된 설문지를 사용하여 데이터를 수집했다. 목 부담자세와 목 장애 관련 요인에 대한 보정 교차비와 95% 신뢰구간(CI)을 알아보기 위해 로지스틱 회귀분석을 시행하였다.
결과
목 장애 유병률은 활선작업자(22.6%)에서 가장 높았으며, 연령이 높아질수록 증가하는 경향을 보였다. 목 장애 관련 요인은 우울증(8.13, 95% CI: 4.02~16.43), 경추 외상 병력(3.53, 95% CI: 1.88~6.63), 경추 방사선학적 퇴행성 변화(2.35, 95% CI: 1.36-4.07)였다. 직업적 요인으로 활선작업자의 보정교차비는 2.10 (95% CI: 1.12-3.92)이었고, 절연스틱을 주당 10시간 이상 사용하는 경우 보정교차비는 2.46 (95% CI: 1.32-4.61)이었다. 또한, 높은 목 신전 부담의 보정교차비는 1.98 (95% CI: 1.14-3.46)이었다.
결론
연령, 우울증, 경추 외상, 경추의 퇴행성 변화와 같은 일반적 요인뿐만 아니라 활선작업, 절연스틱 사용, 목 부담 자세와 같은 직업적 요인은 국내 배전보수원의 목 장애를 유발하는 위험 요인이다. 이러한 결과는 배전보수원의 작업환경 개선의 필요성을 시사한다.

Citations

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List of occupational diseases among farmers in Korea: a literature review
Hansoo Song, Seok-Ju Yoo, Won-Ju Park, Seunghyeon Cho, Ki Soo Park, Joo Hyun Sung, Sang Jin Park, Seong-yong Yoon, Kyeongsoo Kim, Dong-phil Choi, Hye-min Kim, Bounggyun Ju, Kanwoo Youn
Ann Occup Environ Med.2025; 37: e2. CrossRef

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Special Article

Approval status and characteristics of work-related musculoskeletal disorders among Korean workers in 2020: Eun-woo Cha, Sae-mi Jung, Il-ho Lee, Dae Hwan Kim, Eui Hyek Choi, In-ah Kim, Yong-kyu Kim, Kyung-joon Lee, Yang Won Kang, Ho-gil Kim, Young-ki Kim; Ann Occup Environ Med 2022;34:e31. Published online October 26, 2022; DOI: https://doi.org/10.35371/aoem.2022.34.e31

Abstract Abstract in Korean PDF PubReader ePub

Background

This study aimed to investigate the characteristics of work-related musculoskeletal disorders (WRMSDs) in occupational disease claims and identify patterns of WRMSDs for each body part by industry and occupation.

Methods

This study analyzed the raw data of occupational disease claims for musculoskeletal disorders deliberated by the Occupational Disease Decision Committee of the Korea Workers’ Compensation & Welfare Service in 2020. The data was classified into 6 body parts with the highest numbers of occupational disease cases by using the complete enumeration data on principal diagnoses and 4 types of subdiagnoses in the raw data. The characteristics and approval rates of WRMSDs by body part, industry and occupation were examined and summarized.

Results

A total of 13,015 occupational disease cases for WRMSDs were classified, and lumbar spinal (back) diseases accounted for the largest proportion of claimed diseases, followed by shoulder, elbow, wrist, knee, and neck diseases in a descending order. The occupations with the highest and second highest numbers of occupational disease cases by body part were found to be automobile assemblers and production-related elementary workers for the neck, school meal service workers and cooks for the back, construction frame mold carpenters and school meal service workers for the shoulder, elementary workers in mining and food service workers for the elbow, food service workers and automobile parts assemblers for the wrist, and ship welders and school meal service workers for the knee.

Conclusions

This study examined the characteristics and approval status of WRMSDs by body part and occupation. Based on the study results, management strategies for the prevention of WRMSDs should be established regarding occupations with a high risk of WRMSDs for each body part.

업무상 근골격계질환의 2020년 산업재해 승인 현황과 특성
목적
본 연구는 업무 관련 근골격계 질환(WMSD)의 특성과 신체 부위에 따른 업종 및 직종별 WMSD 승인율을 분석하기 위해 실시됐다.
방법
2020년 근로복지공단 업무상질병판정위원회에서 심의된 근골격계질환 신청건의 원자료를 활용하여 분석하였다. 원자료의 주상병과 네가지 부상병 정보 전수를 활용하여, 상병신청건수가 많은 6개의 신체부위로 구분하였다. 각 부위별로 업종 및 직종에 대하여 특성과 승인율을 정리 하였다.
결과
WMSD 신청건수는는 총 13015건이 분류되었고, 이중 요추질환이 가장많았고, 어깨, 팔, 손목, 무릎, 경추 순으로 이어졌다. 부위별로 신청건수가 많았던 직종으로 경추는 자동차조립, 제조관련단순종사원, 요추는 급식조리사, 조리사, 어깨는 건설형틀목공, 급식조리사, 팔은 광업단순종사원, 급식조리사, 손목은 급식조리사, 자동차부품조립, 무릎은 조선용접공, 급식조리사로 조사됐다.
결론
신체 부위별 직종에 따른 WMSD의 특성 및 승인율 등을 살펴보았다. 이러한 결과를 바탕으로 신체 부위별 고위험 직종에 대하여 WMSD 예방을 위한 관리 전략이 수립되어야 한다.

Citations

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Self-Esteem Trajectories After Occupational Injuries and Diseases and Their Relation to Changes in Subjective Health: Result From the Panel Study of Workers’ Compensation Insurance (PSWCI)
Seong-Uk Baek, Won-Tae Lee, Min-Seok Kim, Myeong-Hun Lim, Jin-Ha Yoon, Jong-Uk Won
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BMC Public Health.2023;[Epub] CrossRef

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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

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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

Characteristics of occupational musculoskeletal disorders of five sectors in service industry between 2004 and 2013: Hyun-Woo Choi, Young-Ki Kim, Dong-Mug Kang, Jong-Eun Kim, Bo-Young Jang; Ann Occup Environ Med 2017;29:41. Published online September 19, 2017; DOI: https://doi.org/10.1186/s40557-017-0198-4

Abstract PDF PubReader ePub

Background

‘Work related musculoskeletal disorders (WRMSDs)’ have been mostly reported in the manufacturing industry but recently the occurrence of industrial injuries has been constantly increasing in the service industry. This research is going to analyze the data about workers’ compensation for WRMSDs in five different service sectors and identify characteristics of occupations with the highest approved occupations.

Methods

According to the data released from the Korea Worker’s Compensation & Welfare Service, the overview of 12,730 cases of workers’ compensation for WRMSDs in five service sectors from 2004 to 2013 is going to be analyzed and the source data is going to be classified by the Korean Standard Classification of Occupations to select the top five occupations that have the highest number of approval.

Results

After selecting each five occupations from the service sector that have work related musculoskeletal disorders, the result showed that the occupation with the highest number of approval in the health and social care sector were the early childhood educators, cooks in the school canteens in education services sector, garbage collectors in the sanitation and similar services sector, deliverymen in wholesale and retail, consumer goods repair and building cleaners in general management businesses such as those in building maintenance. The major event observed in the top five occupations was the overexertion and reaction as a cause of WRMSDs. The day when the WRMSDs mostly occurred was on Monday and the most likely time was 10 am. The median days away from work and lost working days are 29–90 days and 0–50 days respectively. The difference in each occupation was observed in year of service, age, and gender.

Conclusions

83.21% of the approved cases of workers’ compensation for WRMSDs occurred in the top 25 occupations in all of the five service sectors, which meant that the approval of workers’ compensation is concentrated in specific occupations. This research is going to suggest preventive measures for work related musculoskeletal disorders in the service industry and to help prioritize the preventive measures.

Trial registration

Not applicable.

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Research Article

Hazards and health problems in occupations dominated by aged workers in South Korea: Jungsun Park, Soo Geun Kim, Jong-shik Park, Boyoung Han, Kab Bae Kim, Yangho Kim; Ann Occup Environ Med 2017;29:27. Published online June 26, 2017; DOI: https://doi.org/10.1186/s40557-017-0177-9

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Background

South Korea’s population is aging more rapidly than any other country. Aging of the productive population will lead to shortage of labor and the decreasing quality of the labor force in South Korea. South Korea needs health care strategies to support the establishment of work environments that are appropriate for elderly workers who have reduced physical capacity. This paper aims to identify occupations that are dominated by aged workers and assess the exposure to hazards and work-related health problems of aged workers in these occupations.

Methods

We identified the 20 occupations in South Korea that employ the most aged workers (at least 55 years-old), among all 149 occupations that are defined as minor categories (identified by three digits) by the Korean Standard Classification of Occupations (KSCO). Exposure to hazards and work-related health problems of individuals in these occupations were evaluated by analyzing the results of the fourth Working Conditions Survey of 2014.

Results

Among the 20 occupations that employ the most aged workers, ‘Elementary Occupations’, which the KSCO classifies as major category (9), had the largest proportion of aged workers. After this, there were five occupations of skilled manual workers and six occupations of skilled non-manual workers. Aged workers in elementary and skilled manual occupations reported frequent exposure to job-specific hazards, such as noise, vibrations, high and low temperatures, solvents, and chemicals. Relative to other workers, aged workers in the occupations reported more frequent exposure to ergonomic hazards, such as tiring or painful positions, carrying or moving heavy loads, and repetitive movements, and also reported more work-related musculoskeletal disorders and general fatigue. Injury due to accident was common in machinery-handling occupations.

Conclusion

Job-specific hazards should be reduced to prevent occupation-related disorders in elementary and skilled manual occupations that are dominated by aged workers.

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Research Article

Relationship between Psychosocial Risk Factors and Work-Related Musculoskeletal Disorders among Public Hospital Nurses in Malaysia: Nur Azma Amin, Rusli Nordin, Quek Kia Fatt, Rahim M Noah, Jennifer Oxley; Ann Occup Environ Med 2014;26:23. Published online August 9, 2014; DOI: https://doi.org/10.1186/s40557-014-0023-2

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Objective

This study examined the relationships between psychosocial work factors and risk of WRMSDs among public hospital nurses in the Klang Valley, Malaysia.

Methods

We conducted a cross-sectional study among 660 public hospital nurses. A self-administered questionnaire was used to collect data on the occurrence of WRMSDs according to body regions, socio-demographic profiles, occupational information and psychosocial risk factors. 468 questionnaires were returned (response rate of 71%), and 376 questionnaires qualified for subsequent analysis. Univariate analyses were applied to test for mean and categorical differences across the WRMSDs; multiple logistic regression was applied to predict WRMSDs based on the Job Strain Model’s psychosocial risk factors.

Results

Over two thirds of the sample of nurses experienced discomfort or pain in at least one site of the musculoskeletal system within the last year. The neck was the most prevalent site (48.94%), followed by the feet (47.20%), the upper back (40.69%) and the lower back (35.28%). More than 50% of the nurses complained of having discomfort in region one (neck, shoulders and upperback) and region four (hips, knees, ankles, and feet). The results also revealed that psychological job demands, job strain and iso-strain ratio demonstrated statistically significant mean differences (p < 0.05) between nurses with and without WRMSDs. According to univariate logistic regression, all psychosocial risk factors illustrated significant association with the occurrence of WRMSDs in various regions of the body (OR: 1.52–2.14). Multiple logistic regression showed all psychosocial risk factors were significantly associated with WRMSDs across body regions (OR: 1.03–1.19) except for region 1 (neck, shoulders and upper back) and region 4 (hips, knees, ankles, and feet). All demographic variables except for years of employment were statistically and significantly associated with WRMSDs (p < 0.05).

Conclusions

The findings indicated the high prevalence of WRMSDs in many body regions, and the risks of developing WRMSDs according to the various body regions were associated with important psychosocial risk factors based on the job strain model. These findings have implications for the management of WRMSDs among public hospital nurses in the Klang Valley, Malaysia.

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Case Report

Design and Evaluation of Ergonomic Interventions for the Prevention of Musculoskeletal Disorders in India: Somnath Gangopadhyay, Samrat Dev; Ann Occup Environ Med 2014;26:18. Published online July 1, 2014; DOI: https://doi.org/10.1186/2052-4374-26-18

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Background

Improper workstation, work procedures and tools are found to be the risk factors for the development of musculoskeletal disorders among the informal sector workers of the developing countries. Low cost ergonomic interventions can effectively improve such adverse conditions.

Case presentation

In the present article some studies related to design interventions in different informal and agricultural sectors were discussed and their efficacies were analyzed. It was observed that with the help of appropriate interventions musculoskeletal disorders were reduced, adverse physiological conditions were improved when awkward postures were corrected and ultimately the organisational productivity was increased.

Conclusion

Proper implementation of ergonomic interventions can ultimately improve the economy of the nation.

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Research Article

Work-related Musculoskeletal Disorders in Korea and Japan: A Comparative Description: Eun-A Kim, Minori Nakata; Ann Occup Environ Med 2014;26:17. Published online June 24, 2014; DOI: https://doi.org/10.1186/2052-4374-26-17

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Objectives

Work related Musculoskeletal disorders (WMSD) is one of the most important problem in occupational health system of Korea and Japan, where the OHS system developed in similar socio-cultural environment. This study compared WMSD in Korea and Japan to review similarities and differences in their historical background, and development of prevention policies.

Methods

Scientific articles, government reports, and related official and non-official statistics on WMSD since the 1960s in Japan and Korea were reviewed.

Results

The historical background and basic structure of the compensation system in Korea and Japan largely overlapped. The issuing of WMSD in both countries appeared as upper limb disorder (ULD), named occupational cervicobrachial diseases (OCD) in Japan, and neck-shoulder-arm syndrome (NSA) 30 years later in Korea, following the change from an industrial structure to automated office work. Both countries developed manuals for diagnosis, guidelines for workplace management, and prevention policies. At present, compensation cases per covered insurers for WMSD are higher in Korea than in Japan, due to the social welfare system and cultural environment. Prevention policies in Korea are enforced more strongly with punitive measures than in Japan. In contrast, the Japanese system requires autonomous effort toward risk control and management, focusing on specific risky processes.

Conclusions

WMSD in Korea and Japan have a similar history of identification and compensation structure, yet different compensation proportions per covered insurer and prevention policies. Follow-up study with international cooperation is necessary to improve both systems.

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Research Article

Automation of Workplace Lifting Hazard Assessment for Musculoskeletal Injury Prevention: June T Spector, Max Lieblich, Stephen Bao, Kevin McQuade, Margaret Hughes; Ann Occup Environ Med 2014;26:15. Published online June 24, 2014; DOI: https://doi.org/10.1186/2052-4374-26-15

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Objectives

Existing methods for practically evaluating musculoskeletal exposures such as posture and repetition in workplace settings have limitations. We aimed to automate the estimation of parameters in the revised United States National Institute for Occupational Safety and Health (NIOSH) lifting equation, a standard manual observational tool used to evaluate back injury risk related to lifting in workplace settings, using depth camera (Microsoft Kinect) and skeleton algorithm technology.

Methods

A large dataset (approximately 22,000 frames, derived from six subjects) of simultaneous lifting and other motions recorded in a laboratory setting using the Kinect (Microsoft Corporation, Redmond, Washington, United States) and a standard optical motion capture system (Qualysis, Qualysis Motion Capture Systems, Qualysis AB, Sweden) was assembled. Error-correction regression models were developed to improve the accuracy of NIOSH lifting equation parameters estimated from the Kinect skeleton. Kinect-Qualysis errors were modelled using gradient boosted regression trees with a Huber loss function. Models were trained on data from all but one subject and tested on the excluded subject. Finally, models were tested on three lifting trials performed by subjects not involved in the generation of the model-building dataset.

Results

Error-correction appears to produce estimates for NIOSH lifting equation parameters that are more accurate than those derived from the Microsoft Kinect algorithm alone. Our error-correction models substantially decreased the variance of parameter errors. In general, the Kinect underestimated parameters, and modelling reduced this bias, particularly for more biased estimates. Use of the raw Kinect skeleton model tended to result in falsely high safe recommended weight limits of loads, whereas error-corrected models gave more conservative, protective estimates.

Conclusions

Our results suggest that it may be possible to produce reasonable estimates of posture and temporal elements of tasks such as task frequency in an automated fashion, although these findings should be confirmed in a larger study. Further work is needed to incorporate force assessments and address workplace feasibility challenges. We anticipate that this approach could ultimately be used to perform large-scale musculoskeletal exposure assessment not only for research but also to provide real-time feedback to workers and employers during work method improvement activities and employee training.

Citations

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Original Article

The Prevalence of Musculoskeletal Symptoms and the Ergonomic Risk Factors among Oriental Melon-growing Farmers: Kyu Jung Bae, Kyoung Sook Lee, Yong Ku Kong, Gyung Jae Oh, Soo Jin Lee; Korean Journal of Occupational and Environmental Medicine 2011;23(1):1-8. Published online March 31, 2011; DOI: https://doi.org/10.35371/kjoem.2011.23.1.1

Abstract PDF

OBJECTIVES
The purpose of this study was to investigate the prevalence of musculoskeletal symptoms in oriental melon-growing farmers and to evaluate the ergonomic risk factors of melon cultivation.
METHODS
The study included 217 subjects growing oriental melons mainly in 3 villages. Subjects were interviewed by means of a structured questionnaire. Instruments used the general features and symptom table of NIOSH to evaluate tasks using ergonomic tools (REBA, OWAS).
RESULTS
A total of 202 final respondents answered. The prevalence of musculoskeletal symptoms based on the NIOSH standard criteria was 162 (75.2%). The prevalence per body part for lower back, knee and shoulder were 102 (50.5%), 86 (42.6%) and 71 (35.1%), respectively. The prevalence of pain complaints of the musculoskeletal symptom was 91 (45.0%). The prevalence of complaints per body part of lower back, knee and shoulder were 54 (26.7%), 41 (20.3%) and 37 (18.3%), respectively. Logistic regression analysis showed men were at higher risk compared to women (OR=2.409, 95% CI=1.071~5.389), and ore than 30 years of work having a higher risk compared to less than 30 years of work (OR=2.445, 95% CI=1.150~5.197). High risk tasks were moving around boxes and nursery plants for planting, transplanting nursery plants, and picking melons.
CONCLUSIONS
Musculoskeletal symptoms were very highly prevalent in oriental melon-growing farmers, showing up in 75.2% of cases. They were exposed to ergonomic high risk factors such as squatting. These risk factors must be improved in some way.

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Do Yeon Won, Ji Hye Choi, Chang Hyeon Baek, Na Yun Park, Min Gu Kang, Young Jin Seo
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Evaluation of the prevalence of musculoskeletal symptoms, presumptive diagnosis, medical care use, and sick leave among female school meal service workers
Young Hoon Moon, Young Joon Yang, Sang Yoon Do, Jae Yoon Kim, Chul Gab Lee, Hong Jae Chae, Soo Hyeon Kim, Han Soo Song
Annals of Occupational and Environmental Medicine.2019;[Epub] CrossRef
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Original Article

The Effects of Disabilities of the Upper Extremities on Daily Activities of Workers in Manufacturing Industry, and the Factors Influencing Those Disabilities: Kyoo Sang Kim, Chang Woo Hong, Min Gi Kim; Korean Journal of Occupational and Environmental Medicine 2009;21(2):115-130. Published online June 30, 2009; DOI: https://doi.org/10.35371/kjoem.2009.21.2.115

Abstract PDF: OBJECTIVES
Discomfort in the upper extremities affects and restricts the daily activities and work of many workers. This study was conducted to apply a standardized tool for identifying musculoskeletal symptoms and measuring how greatly these symptoms affect the performance of workers in small manufacturing industries as well as to analyze the relationships between the socio-demographic characteristics of the workers, the psychosocial factors, and ergonomic risk factors on the one hand and the reported musculoskeletal symptoms and their effects on work performance on the other.
METHODS
Workers in small manufacturing companies were asked to self-evaluate musculoskeletal symptoms, restrictions on work performance, and the ergonomic risk in their working environments. A standardized tool (musculoskeletal symptoms table, DASH [Disability of the arm, shoulder, and hand]) was used to evaluate the musculoskeletal symptoms and the restrictions on work performance.
RESULTS
1) The DASH score was significantly higher among women, older workers who had been in that job for a long time, married workers, those with no leisure activities or hobbies, those with long hours of housework, those who had experienced a disease in the past, and those who had had an accident in the past; 2) the DASH score was also significantly higher for those workers who were unsatisfied with their work, who worked hard, who no control over their work, and whose work required heavy equipment, tools, and materials; 3) the DASH score was significantly higher in workers with major ergonomic risk factors; 4) the DASH score was significantly higher among workers with occupational musculoskeletal disease and was distributed as follows, from highest to lowest rates of occurrence; symptoms in the upper arms, difficulty sleeping, difficulty with work, restrictions in daily activities, restrictions in social activities, and difficulties in specific work performance; 5) explanatory power increased in the model with the addition of socio-demographic variables, i.e., in analyses with the DASH total score as the dependent variable and psychosocial factors, ergonomic risk factors, and upper extremity discomfort symptoms as the independent variables. The total explanatory power found a significant effect at 35.3%.
CONCLUSIONS
The results of this study show that to enhance the upper extremity performance level of workers in the manufacturing industry, preventive measures should be based on a consideration of ergonomic risk factors, psychosocial factors, and the socio-demographic characterisitics of the individual workers.

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Original Article

Validity of NIOSH- and Nordic-style Questionnaires in the Screening and Surveillance of Neck and Upper Extremity Work-related Musculoskeletal Disorders: Won Jun Choi, Nak Jung Sung, Young Joong Kang, Sang Hwan Han; Korean Journal of Occupational and Environmental Medicine 2008;20(3):205-214. Published online September 30, 2008; DOI: https://doi.org/10.35371/kjoem.2008.20.3.205

Abstract PDF

OBJECTIVES
The study aimed to compare the validity of two questionnaires (NIOSH- and Nordic-style) which are used for the screening and surveillance of neck and upper extremity work-related musculoskeletal disorders. To evaluate the validity, clinical examination was used as the reference.
METHODS
Two types of questionnaire were filled out by 208 workers from three different plants in Incheon, Korea. Workers underwent clinical examination by three occupational physicians. The presence of a symptom or sign in at least one body region was regarded as positive in both results of questionnaire and case definition using clinical examination. Validity was evaluated by sensitivity, specificity, positive predictive value, negative predictive value and agreement (Kappa coefficient). For the Nordic-style questionnaire, the sum of the symptom scores was used to yield the ROC curve.
RESULTS
The results of the NIOSH-style questionnaire were sensitivity 59.5%, specificity 68.0%, positive predictive value 68.0%, negative predictive value 59.5%, and Kappa coefficient 0.27(95% confidence interval [CI]=0.14~0.40). The results of the Nordic-style questionnaire were sensitivity 73.9%, specificity 68.0%, positive predictive value 72.6%, negative predictive value 69.5%, and Kappa coefficient 0.42 (95% CI=0.30~0.54). For the Nordic-style questionnaire, sensitivity was 72.1% and specificity was 70.1% based on the sum of the symptom scores > or =2.
CONCLUSIONS
Both questionnaires demonstrated appropriate validity for the screening and surveillance of work-related musculoskeletal disorders. The selection of questionnaire may depend on the purpose of investigation and characteristics of the work place.

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Original Article

Relationship Between Self-reported Symptoms of Work-related Musculoskeletal Disorders and Health Related Quality of Life: Jin Wook Bahk, Sangchul Roh; Korean Journal of Occupational and Environmental Medicine 2007;19(2):156-163. Published online June 30, 2007; DOI: https://doi.org/10.35371/kjoem.2007.19.2.156

Abstract PDF

OBJECTIVES
To explore the relationship between symptoms of work-related musculoskeletal disorders (WMSDs) and health-related, quality of life (QoL).
METHODS
WMSDs symptoms were measured by a self-assessed questionnaire on musculoskeletal disorders symptoms and health-related QoL was measured by SF-36. Analysis of variance and logistic regression were used to analyze the relationship between WMSDs and health-related QoL.
RESULTS
The prevalence of WMSDs was 64.6% in the upper limbs, 44.0% in the low back, and 39.6% in the lower limbs. Subjects with musculoskeletal symptoms had significantly lower scores on all SF-36 dimensions than those without symptoms among all body parts. Compared with the control, the case's odds ratio was higher in all SF-36 dimensions, especially for physical functioning.
CONCLUSIONS
WMSDs have a negative effect on health-related QoL. The essential prevention of WMSDs requires intervention for health promotion in manufacturing workers.

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Original Article

Risk Factor Assessment Using Surface Electromyography and Electrogoniometer among Automobile Part Manufacturers: Dongmug Kang, Cheol Ho Yee, Yong Chul Shin, Eun A Kim, Ji Hoon Woo, Byung Mann Cho, Su Ill Lee; Korean Journal of Occupational and Environmental Medicine 2005;17(4):267-277. Published online December 31, 2005; DOI: https://doi.org/10.35371/kjoem.2005.17.4.267

Abstract PDF

OBJECTIVES
As automobile part manufacturing is characterized by high speed and high repetition, observation methods which are usually utilized for static posture are inappropriate to evaluate musculoskeleatal risk factors. This study quantified the risk factors of musculoskeletal disorders on the forearm and suggested exposure limits by estimating the risk factors using surface electromyography (EMG) and electrogoniometer.
METHODS
Ten percent of the total workers at 3 automobile part manufacturing factories were randomly selected, and 99 male workers were recruited as study subjects. The study was conducted during May 2003 to September 2004. The workers were equipped with electrogoniometers on the wrist and the elbow, surface EMGs on the skin of the flexor digitorum superficialis (FDS) and extensor carpi radialis (ECR) muscles, and the heart beat recorder during work as indicators of joint movement, local muscle tension and physical work load, respectively.
RESULTS
After controlling for age, body mass index and job stress, wrist flexion maximum angle, FDS relative activity (RA) and ECR RA were significantly associated with forearm musculoskeletal symptoms. The odds ratios of the forearm were 5.0(95% CI: 1.1-22.7), 14.0(95% CI: 1.5-128.8) and 7.3(95% CI: 1.1-49.4) for wrist flexion maximum angle more than 76 degrees, FDS RA more than 2.8%, and ECR RA more than 3.5%, respectively.
CONCLUSIONS
Joint angle and focal muscle activity were associated with forearm musculoskeletal symptoms. To reduce forearm musculoskeletal symptoms among automobile part manufacturers, the wrist flexion angle, and FDS and ECR activity need to be reduced below the guidelines recommended in this study.

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Original Article

Characteristics and Odds Ratio of Work Related Musculoskeletal Disorders According to Job Classification in Small-to-medium-sized Enterprises: Shin Goo Park, Jong Young Lee; Korean Journal of Occupational and Environmental Medicine 2004;16(4):422-435. Published online December 31, 2004; DOI: https://doi.org/10.35371/kjoem.2004.16.4.422

Abstract PDF

OBJECTIVES
This study was carried to investigate the prevalence and odds ratio of work related musculoskeletal disorders according to the job classification in small-to-medium-sized enterprises(<300 employee).
METHODS
A questionnaire survey was given to 746 workers in 8 workplaces. 501 workers (67.2%) were finally selected in this study. The workers in the 8 workplaces was divided into 7 jobs. Those were manufacturers(metal), assemblers(appliances), cashiers, packers(cosmetics), garbage collectors, and VDT workers. Multiple logistic regression was used to estimate the odds ratios of the musculoskeletal symptoms according to the job classification.
RESULTS
Univariate analysis showed that the significantly related risk factors for musculoskeletal symptoms are as follows; age, marital status, gender, work load change, work duration, hours worked per day, job demand, decision latitude, type of job. According to the type of job, the prevalence of musculoskeletal symptoms were 7.7%(clerks), 24.3%(manufacturers), 30.0%(assemblers), 23.0%(cashiers), 30.4%(packers), 11.9%(garbage collectors), 29.2%(VDT workers). Multiple logistic regression showed that the following significant odds ratios (referenceclerks): 7.32(packers), 5.63(assemblers), 5.11(cashiers), 4.79(VDT workers), 3.11(manufacturers).
CONCLUSION
In small-to-medium-sized enterprises, the job classification was major risk factor for work related musculoskeletal disorders. According to the job classification, the odds ratios of the work related musculoskeletal disorders were different. Considering the odds ratios, the establishment of a prevention program of work related mus-culoskeletal disorders is recommended.

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Original Article

Risk Factors of Work-related Musculoskeletal Symptoms Among Ship-yard Workers: Jong Eun Kim, Dong Mug Kang, Yong Chul Shin, Mi A Son, Jung Won Kim, Jin Hong Ahn, Young Ki Kim, Deog Hwan Moon; Korean Journal of Occupational and Environmental Medicine 2003;15(4):401-410. Published online December 31, 2003; DOI: https://doi.org/10.35371/kjoem.2003.15.4.401

Abstract PDF

OBJECTS: This study was conducted to prepare the primitive data of work-related musculoskeletal disorders (WMSDs) among ship-yard workers in order to set up management and prevention strategies by investigating the risk factors for WMSD symptoms.
METHODS
We carried out a self-administered questionnaire survey of 7,237 blue-collar workers during October 2001, in a ship-yard of Kyungsangnam Province. We collected 2,223 questionnaires and analysed 1,985. The questionnaires included demographic data, quick exposure check (QEC) for ergonomic risk factors, and Karasek's job content questionnaires (JCQ) for job stress. WMSDs were evaluated by the National Institute of Occupational Safety and Health (NIOSH) surveillance criteria.
RESULTS
Multiple logistic regression analysis was used to examine the relationship between risk factors and musculoskeletal symptoms. From the results, significant variables were age, maximum weight of manual handling material, frequency of the back movement during manual handling tasks, deviation or bending of the wrists/hands position, excessively bent or twisted head/neck, job dissatisfaction, and high job demand.
CONCLUSIONS
In order to reduce musculoskeletal disorders of ship-yard workers, it is recommended to reduce the frequency of back movement during manual handling tasks, wrists/hand deviation or bending, and neck bending or twisting. In addition, devoted effort is needed to increase job satisfaction and to reduce job demand.

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Original Article

Risk Factors Related to Musculoskeletal Symptoms in Shipyard Workers: Byung Chan Park, Hae Kwan Cheong, Soo keun Kim; Korean Journal of Occupational and Environmental Medicine 2003;15(4):373-387. Published online December 31, 2003; DOI: https://doi.org/10.35371/kjoem.2003.15.4.373

Abstract PDF

OBJECTIVES
The aim of this study is to determine the risk factors related to musculoskeletal disorders in shipyard workers.
METHODS
A questionnaire survey was performed on 2,140 shipyard workers in a shipyard in Ulsan city. The questionnaire consisted of questions on the general characteristics, the health behavior, work type and duration, physical burden, job control, type of instruments used, posture, and musculoskeletal symptoms. Definition of musculoskeletal disorders was based on either NIOSH criteria and Kim's criteria.
RESULTS
Positive rate of musculoskeletal disorders in any one part of the body was 77.2% by NIOSH criteria and 60.7% by Kim's criteria. Positive rate of the symptoms increased in workers with longer work hours, with a severe physical burden, and without any control over their job. Work with a more frequent unstable posture and for longer hours was also associated with increased musculoskeletal symptoms. Multiple logistic regression analysis showed that unstable posture and physical burden is closely related to the positive rate of musculoskeletal symptoms after controlling for age, smoking, drinking, exercise, duration of work, and job control; showing a good dose-response relationship.
CONCLUSION
Inadequate posture and physical burden were the most significant factors affecting musculoskeletal disorders in shipyard workers in this study. Therefore, it will be necessary to make efforts to reduce the prevalence of musculoskeletal disorders related to a specific job, instrument, physical burden, and posture. Workers should be educated on the types and prevalence of musculoskeletal disorders, how to improve the ergonomic occupational environment and to set up preventive measures against the risk factors during work.

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Musculoskeletal Disorder Symptoms and Its Related Factors among Male Workers in Manufacturing Industries
Seung-Hyun Lee, Young-Chae Cho
Journal of the Korea Academia-Industrial cooperation Society.2015; 16(10): 6627. CrossRef
Risk factors of work-related upper extremity musculoskeletal disorders in male cameramen
Jung ho Kim, Byung seong Suh, Soo Geun Kim, Won sool Kim, You il Shon, Hee seung Son
Annals of Occupational and Environmental Medicine.2015;[Epub] CrossRef
Prevalence of Musculoskeletal Disorders Among Korean Police Personnel
Hak Young Rhee, Jae Hwan Cho, Jong Min Seok, Taek Sang Cho, Woo Jin Jeon, Jin Gu Lee, Sung Kyu Kim
Archives of Environmental & Occupational Health.2015; 70(4): 177. CrossRef
Factors Affecting the Musculoskeletal Symptoms of Korean Police Officers
Taek-Sang Cho, Woo-Jin Jeon, Jin-Gu Lee, Jong-Min Seok, Jae-Hwan Cho
Journal of Physical Therapy Science.2014; 26(6): 925. CrossRef
Musculoskeletal Disorder Symptoms and Related Factors among Male Workers in Small-scale Manufacturing Industries
Seung-Hyun Lee, Ju-Yeon Lee, Young-Chae Cho
Journal of the Korea Academia-Industrial cooperation Society.2012; 13(9): 4025. CrossRef
Ergonomic Research Trends in the Shipbuilding Industry: Present and the Future
Yu-Chang Kim
Journal of the Ergonomics Society of Korea.2012; 31(1): 131. CrossRef
Musculoskeletal Symptoms and Its Related Factors among Male Workers in a Nonferrous Manufacturing Industry
Yeon-Ok Jeong, Young-Chae Cho
Journal of the Korea Academia-Industrial cooperation Society.2012; 13(8): 3552. CrossRef
Survey of the Musculoskeletal Disorders of Riot Police and Conscripted Policeman in Radiologic Examination
Jae-Hwan Cho, Maeng-Jin Kang, Jong-Min Seok, Sung-Joon Jeun, Youn-Shik Lim, Jae-Kyo Jeong, Hyeon-Ju Kim, Myeong-Shik Ju, Kyung-Rae Dong, Cheol-Soo Park, Jin Lee, Hae-Kag Lee
Journal of the Korean Society of Radiology.2011; 5(6): 315. CrossRef
Characteristics of Work-related Musculoskeletal Disorders in Korea and Their Work-relatedness Evaluation
Kun Hyung Kim, Kyoo Sang Kim, Day Sung Kim, Sun Je Jang, Ki Hun Hong, Seung-Won Yoo
Journal of Korean Medical Science.2010; 25(Suppl): S77. CrossRef
Risk Factors of Work-related Upper Extremity Musculoskeletal Disorders in Male Shipyard Workers: Structural Equation Model Analysis
Byung-Chan Park, Hae-Kwan Cheong, Eun-A Kim, Soo Geun Kim
Safety and Health at Work.2010; 1(2): 124. CrossRef

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Original Article

Characteristics of Work-Related Musculoskeletal Disorders and Effect of Intervention Program in Shipyard Workers: Hong Jae Chae, Seong Kwan Lee, Kang Jin Lee, Jai Dong Moon; Korean Journal of Occupational and Environmental Medicine 2002;14(4):468-477. Published online December 31, 2002; DOI: https://doi.org/10.35371/kjoem.2002.14.4.468

Abstract PDF

OBJECTIVES
This study was conducted to estimate the characteristics of work-related musculoskeletal disorders and the effect of intervention program in shipyard workers.
METHODS
Information on work related absences,due to musculoskeletal disorders, were collected between January, 1 2000 and August, 31 2002. Age, duration of work, job type, anatomical site of disease, cause and duration of absence due to sickness were investigated.
RESULTS
From a total of 158 cases there were 108(68.4%)and 50(31.6%)cases of back, and other musculoskeletal complaints,respectively. 55(34.8%)of the cases were caused by repetitive trauma and 103(65.2%)were due to non-repetitive causes. 90(83.3%)of the back complaint cases were due to non-repetitive causes, but there was a repetitive cause of other musculoskeletal complaints in 37(74.0%)cases. Back complaints were higher in workers carrying heavy materials, but other musculoskeletal complaints were higher in painting workers.Half of workers after an absence due to sickness had returned to work within 32.0 weeks and 25.4 weeks,in the cases of back and other musculoskeletal complaints, respectively. After the application of an intervention program for musculoskeletal disease, the incidence rate of absence due to work-related musculoskeletal disorders was reduced significantly.
CONCLUSION
The introduction of a musculoskeletal intervention program reduced absences due to work-related musculoskeletal disorders.

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A study on Related Factor and Knowledge of Back Pain in Workers Employed at Cement factory
Gi-Yeol Kim, Jung-Lim Oh, Kyoung-Ok Hwang
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Yu-Chang Kim
Journal of the Ergonomics Society of Korea.2012; 31(1): 131. CrossRef
Medical Managements of Musculoskeletal Diseases in Shipbuilding Industry
Jong-Eun Kim, Young-Ki Kim, Dong-Mug Kang
Journal of the Ergonomics Society of Korea.2012; 31(1): 157. CrossRef
Related Factors to Musculoskeletal Discomfort Symptoms on Some Middle·High school Teachers
Jae-Yoon Lee, Byeong-Yeon Moon, Youn-Hong Jeong, Hyun-Kyung Woo
Journal of the Korea Academia-Industrial cooperation Society.2012; 13(1): 264. CrossRef

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Original Article

Cumulative Trauma Disorders Among Shipyard Workers and Application of Baseline Checklist for Risk Assessment: Sang Hwan Han, Nam Jong Paik, Donghyun Park, Ki Eon Jang, Myung Hag Lee, Jong Tae Park, Dae Sung Kim, Yeon Sook Lee, Kyung Ja Paik, Young Soo Shin, Dong Bin Song; Korean Journal of Occupational and Environmental Medicine 1997;9(4):579-588. Published online December 31, 1997; DOI: https://doi.org/10.35371/kjoem.1997.9.4.579

Abstract PDF

Cumulative trauma disorders were surveyed in a cross-sectional study of 100 male ship yard workers and 43 male office workers. And baseline checklist for risk assessment of cumulative trauma disorders was applicated in a ship making process. Cases of cumulative trauma disorders were defined using physical examinations and electronic diagnostic methods. Data on demographics, individual factors (medical condition), work organization and psychosocial aspects of work were obtained by questionnaire. Association between the above factors and cumulative trauma disorders were assessed by multiple logistic regression models. 29(29 %) participants of male shipyard workers and 4(9.2 %) study subjects of male office workers met our case definitions for cumulative trauma disorders. The myofascial pain syndrome of neck muscles(12 % of participants) and carpal tunnel syndrome(5 % of participants) were the major two medical conditions in shipyard workers. The odds of male shipyard workers for cumulative trauma disorders to male office workers was 3.15 after adjustment of age(95 % C.I. :2.25-5.44). And the variables such as duration of present job, HIVD condition, and surges in workload were associated at least one of the cumulative trauma disorders in the final models (p<0.05) . This study indicates that work related upper extremity musculoskeletal disorders are relatively common among shipyard workers, and shows that the psychosocial factors is not likely to be related to the occur rences of these disorders in heavy workers. Also we developed baseline checklist for risk assessment of cumulative trauma disorders. The checklist was unique in that its expected users were industrial hygienists and occupational healthing nurses who did not have much ergonomic background and in that it was targeted to Korean workers in various types. As the first application of the checklist, shipyard workers were evaluated.

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Medical Managements of Musculoskeletal Diseases in Shipbuilding Industry
Jong-Eun Kim, Young-Ki Kim, Dong-Mug Kang
Journal of the Ergonomics Society of Korea.2012; 31(1): 157. CrossRef
Symptom Prevalence of Musculoskeletal Disorders and the Effects of Prior Acute Injury among Aging Male Steelworkers
Won‐Jun Choi, Young‐Joong Kang, Ji‐Young Kim, Sang‐Hwan Han
Journal of Occupational Health.2009; 51(3): 273. CrossRef

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Original Article

Symptom Prevalence of Work-Related Musculoskeletal Disorders and Related Factors among Bank Workers by Visual Dispaly Terminal Use: Shang Hyuk Yim, Yun Geun Lee, Jung Jin Cho, Jeong Il Son, Jae Cheol Song; Korean Journal of Occupational and Environmental Medicine 1997;9(1):85-98. Published online February 28, 1997; DOI: https://doi.org/10.35371/kjoem.1997.9.1.85

Abstract PDF

The purpose of this study is to investigate the relationship between the self-reported musculoskeletal symptoms and related factors among VDT operators in bank. The subjects were 950 women workers. The characteristics of subjects were 26.6 years of average age, 5.7 years of average VDT use duration and 6.5 hours of daily VDT use time. The results were as follows. The prevalence of self-reported musculoskeletal symptoms more than severe in Likert scale were 51.4%, 43.9% at the shoulder, 38.3%, 31.8% at the lower back, 38.0%, 31.3% at the neck, 31.2%, 25.2% at the upper back, 21.7%, 16.5% at the wrist and 13.6%, 8.8% at the fingers (while on duty, after home-coming). General characteristic variables affecting the musculoskeletal symptoms were married, number of child and daily house-working time. Work-related factors affecting the musculoskeletal symptoms were VDT working career, daily working time, daily VDF use time, VDF use time without rest, daily work-load and regular rest. As the result of the multiple logistic regression analysis, daily working time, daily VDT use time and VDT working career were significant variables accounting for the musculoskeletal symptoms.

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Work-related Musculoskeletal Disorders in Korea Provoked by Workers’ Collective Compensation Claims against Work Intensification
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