Annals of Occupational and Environmental Medicine

Original Article

A pilot study to assess a risk of a high-risk group of low back pain membership in workers who perform the manual material handling tasks: Sungho Lee, Seongchan Heo, Jong-Young Lee; Ann Occup Environ Med 2021;33:e34. Published online November 17, 2021; DOI: https://doi.org/10.35371/aoem.2021.33.e34

Background

We conducted this experimental study to estimate a risk of a high-risk group of low back pain (LBP) membership in workers who perform the manual material handling (MMH) tasks in an actual workplace setting.

Methods

The subjects include healthy workers who were engaged in 12 MMH tasks at 6 manufacturing companies. We assessed the dynamic motion of trunk or lumbar spine using an industrial lumbar motion monitor (BioDynamics Laboratory of Ohio State University). The subjects were evaluated for the age, gender, years of working and anthropometric measurements (e.g., height, weight, shoulder height, elbow height, iliac height, leg length, trunk length, trunk circumference, iliac width, iliac depth, xiphoid width and xiphoid depth). Moreover, they were also evaluated for a risk of a high-risk group of LBP membership based on lift frequency, average twisting velocity, maximum moment, maximum sagittal flexion and maximum lateral velocity.

Results

The subjects who were engaged in a packaging at a detergent manufacturing company are at the greatest risk of LBP (63.76%). This was followed by packaging at a leather product manufacturing company (57.06%), packaging at a non-metallic casting material manufacturing company (57.03%), manual injection at a non-metallic casting material manufacturing company (52.00%), toggling at a leather product manufacturing company (46.09%), non-metallic casting material manufacturing company (42.88%), rolling at a non-metallic mineral product manufacturing company (42.12%), shooting at a non-metallic casting material manufacturing company (40.99%), vacuum processes at a leather product manufacturing company (35.00%), looping at a general industrial machinery manufacturing company (33.93%), setting at a leather product manufacturing company (30.22%) and packaging at a general metal product manufacturing company (22.02%).

Conclusions

Our approach indicates that there is a risk of a high-risk group of LBP membership in workers who perform the MMH tasks.

Citations

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ERGONOMİK RİSK DEĞERLENDİRME YÖNTEMLERİYLE TESPİT EDİLMİŞ FİZİKSEL İŞ YÜKÜ İLE ENERJİ TÜKETİMİNİN DEĞERLENDİRİLMESİ
Emin Kahya, Ceyda Özgen, Nasiba Jorayeva
Eskişehir Osmangazi Üniversitesi Mühendislik ve Mimarlık Fakültesi Dergisi.2024; 32(2): 1315. CrossRef
Research misconduct using a ghostwriter in a paper-writing company
Kyunghee Jung-Choi
Annals of Occupational and Environmental Medicine.2023;[Epub] CrossRef

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Original Article

Factors related to depressive symptoms in Korean self-employed workers: Hanjun Kim, Jungsun Park, A Ram Kim, Yangho Kim; Ann Occup Environ Med 2021;33:e20. Published online June 15, 2021; DOI: https://doi.org/10.35371/aoem.2021.33.e20

Abstract Abstract in Korean PDF PubReader ePub

Background

We examined factors related to depressive symptoms in Korean self-employed workers.

Methods

This secondary analysis examined data of 14,454 self-employed individuals from the fifth Korean Working Conditions Survey (2017). Multiple logistic regression analysis was used to assess the relationship of depressive symptoms with different variables.

Results

Self-employed workers who had a good work-life balance, a good subjective health, and worked 40 to 48 hours or 48 to 60 hours/week were less likely to report depressive symptoms (all p < 0.05). However, those who always interacted with angry clients, had severe exposure to ergonomic risk factors, and were exposed to moderate or severe abusive behaviors were more likely to report depressive symptoms (all p < 0.05). Age, gender, weekly work days, and working at very fast speed were unrelated to depressive symptoms.

Conclusions

Several factors known to be related to depressive symptoms do not lead to depression in self-employed individuals. Different interventions may therefore be needed to prevent depression in self-employed workers.

한국의 자영업자에서의 우울증상과 관련된 요인
목적
한국 자영업자와 우울 증상과 관련된 요인들을 분석하였다.
방법
이 2차 분석은 5차 한국근로환경조사(2017)의 14,454명의 자영업자들의 데이터를 조사하였다. 우울 증상과 관련된 다양한 변수들에 대하여 다변량 로지스틱 회귀분석을 이용하여 분석하였다.
결과
고졸 학력, 높은 월간 수입, 좋은 일과 삶의 균형, 주간 40시간에서 48시간 및 48시간에서 60시간 근무한 자영업자들은 우울증상을 보고를 하는 경향이 적었다 (모두 P < 0.05). 그러나 화난 고객과 대하는 경우, 근골격계 위험요소에 크게 노출되는 경우, 폭력적인 행위에 중간 혹은 심하게 노출되는 경우 우울증상을 더 많이 보고하였다 (P < 0.05). 나이, 성별, 직업군, 수입 변화, 주간 근무일수, 빠른 속도의 근무환경등은 우울 증상과 관련이 적었다.
결론
전 연구들과 비교하였을 때, 몇몇 같은 인구통계학적, 사회경제적, 심리사회적 요소들이 자영업자와 임금근로자에서 우울증상을 이끌어낸다. 그러나 몇몇 요소들은 임금근로자와 다르게 나타난다. 따라서 자영업자에서 우울증을 예방하기 위해 다른 간섭이 필요할 것으로 보인다.

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Yu‐Ting Huang, Ming‐Shyan Lin, Kathy James, Chia‐Hao Chang, Wen‐Hsuen Tsai, Yu‐Chih Lin, Mei‐Yen Chen
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Association between physical risk factors and sleep disturbance among workers in Korea: The 5th Korean Working Conditions Survey
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Sleep Medicine.2022; 100: 157. CrossRef
Changes in the Health Indicators of Hospital Medical Residents During the Four-Year Training Period in Korea
Ji-Sung Ahn, Seunghyeon Cho, Won-Ju Park
Journal of Korean Medical Science.2022;[Epub] CrossRef

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Research Article

Comparison of work-related musculoskeletal symptoms between male cameramen and male office workers: Han-Seur Jeong, Byung-Seong Suh, Soo-Geun Kim, Won-Sool Kim, Won-Cheol Lee, Kyung-Hun Son, Min-Woo Nam; Ann Occup Environ Med 2018;30:28. Published online May 2, 2018; DOI: https://doi.org/10.1186/s40557-018-0243-y

Abstract PDF PubReader ePub

Background

Previous studies have classified cameramen’s job as physiologically heavy work and identified the risk factors of work-related musculoskeletal disorders (WRMDs) in cameramen. However, those studies limited their research subjects to cameramen. In this study, we compared the frequency and severity of WRMDs between cameramen and office workers.

Methods

A total of 293 subjects working in four broadcasting companies in Korea were recruited. A questionnaire survey was conducted for a month, starting in October 2016. The subjects were divided into cameramen and office workers according to their occupation. We compared the frequency and severity of WRMDs and ergonomic risk assessment results between the two groups.

Results

The high-risk WRMD group had a higher proportion of cameramen than office workers. Moreover, the high ergonomic risk group also had a higher proportion of cameramen than office workers for WRMDs in the upper extremities and waist+lower extremities. In the multivariable-adjusted model comparing cameramen and office workers, the odds ratio (OR) with 95% confidence interval (95% CI) for high-risk WRMDs was 3.50 (95% CI: 1.92–7.72) for the upper extremities and 3.18 (95% CI: 1.62–6.21) for the waist and the lower extremities. The ORs by body parts were 3.11 (95% CI: 1.28–7.57) for the neck, 3.90 (95% CI: 1.79–8.47) for the shoulders, and 4.23 (95% CI: 1.04–17.18) for the legs and feet.

Conclusions

Our study suggests that cameramen are at high risk of WRMDs. Workplace improvements and management of the neck, shoulders, and lower extremities, which are susceptible to WRMDs, are necessary to prevent musculoskeletal disorders among cameramen.

Citations

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The Association Between Shoulder Pain and Disability Among Saudi Office Workers
Abdullah H Alzahrani, Bijad Alqahtani
Cureus.2023;[Epub] CrossRef
Musculoskeletal symptoms and their associated risk factors among Saudi office workers: a cross-sectional study
Reem S. AlOmar, Nouf A. AlShamlan, Saad Alawashiz, Yaser Badawood, Badr A. Ghwoidi, Hassan Abugad
BMC Musculoskeletal Disorders.2021;[Epub] CrossRef

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Research Article

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; Ann Occup Environ Med 2015;27:5. Published online January 24, 2015; DOI: https://doi.org/10.1186/s40557-014-0052-x

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Objective

The aim of this study is to determine the risk factors related to upper extremities work-related musculoskeletal disorders (WRMSDs) in cameramen.

Methods

A questionnaire survey was performed on 166 cameramen in a broadcasting station. The questionnaire consisted of questions on the general characteristics, the health behavior, work type and duration, physical burden, ergonomic posture, and musculoskeletal symptoms. Definition of musculoskeletal disorders was based on NIOSH criteria.

Results

The positive rate of WRMSDs symptoms by parts of the body was turned out to be the highest in the shoulder (14.5%) and the lowest in arm and elbow (6%). Logistic regression analysis revealed that symptoms in the shoulders increased with BMI (OR = 3.62, 95% CI = 1.03-12.71), physical burden (OR = 9.29, 95% CI = 1.72-61.78 in the very hard group) and ergonomic factors (OR = 4.50, 95% CI = 1.03-19.68). Ergonomic factors were only related to the symptoms of hand and wrist (OR = 10.21, 95% CI = 1.02-102.20). WRMSDs symptoms, in the whole upper extremities, were higher in the 50 or older age group (OR = 5.86, 95% CI = 1.03-33.26), higher BMI group (OR = 3.26, 95% CI = 1.28-13.53), non-exercise group (OR = 2.37, 95% CI = 1.24-12.59), high physical burden group (OR = 7.6, 95% CI = 1.34-52.74), and high grade ergonomic risk group (OR = 4.82, 95% CI = 1.29-16.06).

Conclusion

The most serious musculoskeletal disorders of male cameramen were shoulder pain. Ergonomic factors and physical burden were the most significant factors affecting WRMSDs in cameramen in this study. Cameramen should be educated to be able to improve the ergonomic occupational environment and to set up preventive measures against the risk factors during work.

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Development and validation of a tool for the comprehensive risk assessment of musculoskeletal disorders (CRAMUD) among employees of a steel industry
Saeid Yazdanirad, Gholamhossein Pourtaghi, Mehdi Raei, Mohammad Ghasemi
Theoretical Issues in Ergonomics Science.2023; 24(3): 335. CrossRef
Shoulder pain prevalence by age and within occupational groups: a systematic review
Christopher J. Hodgetts, Charlotte Leboeuf-Yde, Amber Beynon, Bruce F. Walker
Archives of Physiotherapy.2021;[Epub] CrossRef
Comparison of work-related musculoskeletal symptoms between male cameramen and male office workers
Han-Seur Jeong, Byung-Seong Suh, Soo-Geun Kim, Won-Sool Kim, Won-Cheol Lee, Kyung-Hun Son, Min-Woo Nam
Annals of Occupational and Environmental Medicine.2018;[Epub] CrossRef
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Cigdem Ayhan, Seval Tanrıkulu, Gursel Leblebicioglu
Medical Hypotheses.2018; 110: 125. CrossRef

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Research Article

Psychosocial Risk Factors and Musculoskeletal Symptoms among White and Blue-collar Workers at Private and Public Sectors: Leticia B Januario, Mariana V Batistao, Helenice JCG Coury, Ana Beatriz Oliveira, Tatiana O Sato; Ann Occup Environ Med 2014;26:20-20. Published online July 25, 2014; DOI: https://doi.org/10.1186/s40557-014-0020-5

Abstract PDF PubReader ePub

Objectives

The aim of this study was to evaluate musculoskeletal and psychosocial perception and compare these conditions regarding the type of job (white or blue-collar) and the type of management model (private or public).

Methods

Forty-seven public white-collar (PuWC), 84 private white-collar (PrWC) and 83 blue-collar workers (PrBC) were evaluated. Job Content Questionnaire (JCQ) and Utrecht Work Engagement Scale (UWES) were applied to evaluate psychosocial factors. Nordic Musculoskeletal Questionnaire (NMQ) was used to assess musculoskeletal symptoms. Pressure Pain Threshold (PPT) was measured to evaluate sensory responses.

Results

According to JCQ, all groups were classified as active profile. There was a significant association between work engagement and workers’ categories (p < 0.05). PrWC workers had the highest scores for all the UWES domains, while PrBC had the lowest ones. PPT showed that PrBC workers had an increased sensitivity for left deltoid (p < 0.01), and for both epicondyles (p < 0.01), when compared to the other groups. PrWC workers had an increased sensitivity for both epicondyles than PuWC (right p < 0.01; left, p = 0.05). There was no significant association in the report of symptoms across the groups (p > 0.05).

Conclusion

This study showed differences in psychosocial risk factors and musculoskeletal symptoms in workers engaged in different types of jobs and work organization. Personal and work-related characteristics, psychosocial factors and PPT responses were different across workers’ group. Despite all, there was no significant difference in reported symptoms across the groups, possibly indicating that the physical load is similar among the sectors.

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Chun-Hao Tsai, Wan-Ju Cheng, Chih-Hsin Muo, Tsung-Li Lin
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Raphael M. Herr, Jos A. Bosch, Adrian Loerbroks, Annelies E.M. van Vianen, Marc N. Jarczok, Joachim E. Fischer, Burkhard Schmidt
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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;26:15-15. Published online June 24, 2014; DOI: https://doi.org/10.1186/2052-4374-26-15

Abstract PDF PubReader ePub

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.

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Original Article

The Relationship of Physical and Psychosocial Risk Factors to Work-related Musculoskeletal Upper Extremity Symptoms amongst Male Automobile Manufacturing Workers: Ki Hyun Lee, Jin Ha Yoon, Sung Kyung Kim, In Jung Cho, Sung Soo Oh, Sung Hoon Kim, Sei Jin Chang, Bong Suk Cha, Sang Baek Koh; Korean Journal of Occupational and Environmental Medicine 2012;24(1):72-85. Published online March 31, 2012; DOI: https://doi.org/10.35371/kjoem.2012.24.1.72

Abstract PDF

OBJECTIVES
The objective of this study was to determine the relationship of physical and psychosocial risk factors to work-related musculoskeletal upper extremity symptoms amongst automobile manufacturing workers.
METHODS
The cross-sectional study was conducted using male automobile manufacturing workers in order to examine the relationship of physical and psychosocial risk factors to work-related musculoskeletal upper extremity symptoms. A total of 1,793 male workers were asked to complete a self-administered questionnaire. The questionnaire consisted of questions regarding general characteristics, health related behaviors, work-related characteristics, job stress, ergonomic risk factors, and the presence of musculoskeletal symptoms (neck, shoulder, arm, and hand). Work-related musculoskeletal symptoms were evaluated using the National Institute of Occupational Safety and Health (NIOSH) surveillance criteria. In order to measure the physical risk factors, the American National Standard Institute (ANSI) Z-365 Quick checklist was incorporated into the questionnaire. Job stressors were measured using the Korean Occupational Stress Scale (KOSS). A binary logistic regression analysis was performed that examined the relationship of physical and psychosocial risk factors to musculoskeletal symptoms.
RESULTS
The result showed that the physical and psychosocial risk factors were associated with musculoskeletal upper extremity symptoms. The workers with high physical risk factors reported more musculoskeletal symptoms than those having low physical risk factors (OR: 2.37, 95% CI: 1.56~3.62). The workers with high job stress were more likely to have an increased risk of musculoskeletal upper extremity symptom compared to those with normal job stress (OR: 2.65, 95% CI: 2.03~3.47). A significant relationship between the combined effects of physical and psychosocial risk factors on musculoskeletal upper extremity symptoms was also found. The workers exposed to high physical risk factors, high job stress, and long working hours were more likely to report musculoskeletal symptoms than those having low physical risk factors, normal job stress and moderate working hours(OR: 2.37, 95% CI: 1.56~3.62).
CONCLUSIONS
The results suggest that some physical and psychosocial risk factors increase the risk of work-related musculoskeletal upper extremity symptoms amongst automobile manufacturing workers. In order to prevent or reduce musculoskeletal disorders amongst automobile manufacturing workers, it is strongly recommended to manage the physical psychosocial risks occurring in the workplace.

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Original Article

Musculo-skeletal Symptoms of Municipal Sanitation Workers and Ergonomic Evaluation on Upperlimb: Jun Pyo Myong, Hyang Ki Lee, Hyoung Ryoul Kim, Hye Sun Jung, Eun Hee Jeong, Woong Nam, Jung Wan Koo; Korean Journal of Occupational and Environmental Medicine 2008;20(2):93-103. Published online June 30, 2008; DOI: https://doi.org/10.35371/kjoem.2008.20.2.93

Abstract PDF

OBJECTIVES
The aim of this study was to estimate musculo-skeletal symtoms of municipal sanitation workers and to evaluate working conditions of municipal sanitation workers to search for the factors related to musculo-skeletal symptoms.
METHODS
We conducted a descriptive cross-sectional survey. The study subjects were comprised of 543 municipal sanitation workers in some divisions of Seoul and the Gyeonggi province. Musculo-skeletal analysis was done by using the modified criteria of NIOSH musuclo-skeletal symptoms, RULA and, REBA. Statistical analysis was done by using the chi-square test, multiple logistic regression analysis.
RESULTS
72.2% of the subjects complained musculo-skeletal symptoms (39.6% on the upperlimbs, 30.0% on the lumbar region, 27.4% on the legs). For the musculo-skeletal symptoms criteria (1~3), street cleaners complained of more musculo-skeletal symptoms than the solid waste collectors, after classifying the jobs of sanitation workers. On logistic regression analysis of the musculo-skeletal "symptoms criteria1" positive groups, age was related to the criteria positive (prevalence odds ratio=1.018, 95% CI: 0.993-1.046). The worktime was significantly related to 'criteria positive 1 and, 2' (prevalence odds ratio=2.165 (95% CI: 1.156-4.131), 2.187 times (95% CI: 1.071-4.651)). The RULA score, the subtotal A score of RULA, the REBA score and , the total A REBA score of the upperlimbs of solid waste collectors were higher than those of the street cleaners.
CONCLUSIONS
In spite of the lower ergonomic evaluation score of the street cleaner, the street cleaners complained of more musculo-skeletal symptoms than did the solid waste collectors due to more frequent repetitive motions, a longer work time (over 10 hours) etc. It is suggested that the sanitation workers need to use the proper methods to avoid musculo-skeletal disease.

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Original Article

A Study on the Risk Factors of Low Back Pain in Computer Terminal Operators: Cheol Ho Yi, Jung Rae Park, Ae Ri Cha, Kwang Wook Koh, Young Wook Kim, Su Ill Lee; Korean Journal of Occupational and Environmental Medicine 1999;11(2):264-275. Published online June 30, 1999; DOI: https://doi.org/10.35371/kjoem.1999.11.2.264

Abstract PDF

Low back pain in computer terminal operators is a very common but important symptom. While the occupational risk factors of low back pain were approved obscurely, there have been few studies on analysis or understanding of occupational risk factors. Therefore, we studied occupational risk factors of low back pain, especially for ergonomic factors as well as general characteristics of workers. We selected 98 subjects for this study, computer terminal operators ordinary using computers in Pusan. We calculated the subjective severity of low back pain of each operator by the Low Back Pain Scoring System. The relation of low back pain score to general characteristics of worker was also analyzed. We analyzed the relationship between low back pain score and individual efforts to prevent low back pain. We measured the ergonomic factors of each computer terminal operator - Trunk Jnclination(TI), Arm Flexion(AF), Elbow Angle(EA), Head Tilting(HT), Knee Angle(KA), using of foot plate and gap between the popliteum and chair. The correlations between these ergonomic factors and low back pain score were then analyzed. And the results are as follows: 1. The prevalence rate of low back pain in computer terminal operators was 39.8% in this study, when low back pain score was converted by the low back pain scoring system. 2. According to general characteristics of workers related to low back pain, the scores were higher in the older age group, the married and the longer work carriers. (p < 0.05) 3. In the analysis of the relationship between low back pain score and individual effort to prevent low back pain, regular exercise, history of schooling for prevention of low back pain, and declaration of intention to participate in low back pain education or exercise were stastistically significant(p < 0.05). And the more severe the low back pain, the higher the intention to participate in low back pain education they had in this study. 4. In the analyses of relationships or correlations between low back pain score and each of the 7 categories of ergonomic factors, only head tilting had a weak reverse correlation with low back pain(r=-0.2999, p < 0.01). From now on, cohort studies for the risk factors of low back pain of workers, who have been forced to work in non-ergonomical positioning at the work site, will be necessary. On the background of these ergonomic studies, the occupational health profession should be required to manage ergonomic working conditions.

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Original Article

The Ergonomic Evaluation of Low Back Pain of the Manual Lifting Workers: Ji Yong Kim; Korean Journal of Occupational and Environmental Medicine 1998;10(3):343-361. Published online August 31, 1998; DOI: https://doi.org/10.35371/kjoem.1998.10.3.343

Abstract PDF

A cross-sectional study was conducted in the manufacturing welding metal company. The questionnaire survey was performed on 361 workers to investigate the status of low back pain(LBP), and 101 lifting jobs were ergonomically analyzed to evaluate the relationship between LBP and the exposure. Questionnaire survey was performed repeatedly for reliability test and the information in the questionnaire was compared to the absence record for validity test. There were significant differences in tenure and job titles between groups with LBP and without LBP, but not in general characteristics such as age, tenure, marriage status, blood pressure and liver function test. One hundred and one lifting jobs were analyzed by the physiological, psychophysical and biomechanical ergonomic methods. In logistic regression analysis, the lumbar disc compression force and the lifting frequency were the risk factors of the LBP. As the weight load over the action limit was the risk factor in the group of sudden LBP onset, so were the vertebral disc compression force and lifting frequency in the group of insidious LBP onset. Therefore the author concluded that ergonomic analysis may be a useful preventive tool of the LBP. Further prospective epidemiological study will be needed to identify the risk factors of LBP by the ergonomic method.

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Original Article

A Study on Risk Prediction and Prevention Guidelines for CTDs: Dong Hyun Park, Ik Keun Yoon; Korean Journal of Occupational and Environmental Medicine 1996;8(2):282-300. Published online September 30, 1996; DOI: https://doi.org/10.35371/kjoem.1996.8.2.282

Abstract PDF: CTDs have been a growing problems for US and European industries with higher incidence rate every year. In our country, we have just Started to recognize and to work on the problems in industry. In this respect, this would be the first ergonomic-based CTD study with medical data. Two automobile part plants were ergonomically and clinically surveyed for this study. Specifically,' 25 jobs from A industry and 51 jobs from B industry were matched with the clinical data. Two types of analysis were conducted. First, ergonomic job evaluation using CTD checklist was done for both industries to figure out the relative risks for each jobs. Second, comprehensive analysis for risk factors regarding CTDs was conducted. It produced mainly two results. First, multiple regression analysis of both worker and work-related factors on total scores based on the results of the'physical examination showed that there was no statistically significant relationships between total scores based on physical examinations and either worker or work-related risk factors. Second, logistic analyses for both factors were done. An user-friendly logistic program was developed for this analysis and for the future analysis of CTD study in the long-run. The program would have even non-expert in statistical package easily manipulate logistic analysis. Based on the logistic analysis, there was no significant relationships between worker related risk factors and all CTD types except marital status. However, there was some significant results in terms of work-related factors. Lateral pinch and ulnar deviations had significant relationship with both all CTD types and CTS. Power grip was associated with all types of CTDs, Tendinitis and Carpal Tunnel Syndrome. The cycle time had significant effects only on Carpal Tunnel Syndrome. In conclusion, the first ergonomic-based CTD study has been initiated in Korea. However, it was realized that good overall situation for CTD study in Korea has been before the right time yet. Therefore, futher research on the basis of the framework of this study is strongly suggested to have a complete CTD guidelines in the near future.

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