Association between overtime work and work-related musculoskeletal disorders among male employees in the automobile manufacturing industry
Objective To explore the impact of overtime work on work-related musculoskeletal disorders in male employees in the automobile manufacturing industry.Methods A total of 1 731 male employees with more than one year of working experience from an automobile manufacturing industry were selected as the research subjects using judgment sampling method.The Musculoskeletal Disorder Questionnaire was used to investigate the prevalence of musculoskeletal disorder.Employees were divided into control group and overtime group,and a 1:1 matching was performed using propensity score matching method,and 573 pairs were successfully matched.The prevalence of WMSDs in various body parts was compared between the two groups.Results The overtime working rate of the research subjects was 34.2％,and the prevalence of WMSDs was 57.1％.Overtime work increased the risk of WMSDs in the neck,shoulders,upper back,lower back,ankle/feet,and overall body of the workers(all P＜0.05),with the odd ratio and 95％confidence interval of 1.43(1.10-1.85),1.38(1.06-1.80),1.42(1.07-1.89),1.28(1.01-1.62),1.37(1.01-1.87),and 1.49(1.17-1.89),respectively.However,there was no association between overtime work and the risk of WMSDs in the elbows,hands/wrists,hips,and knees of the subjects(all P＞0.05).Conclusion Overtime work increases the risk of WMSDs in the neck,shoulders,upper back,lower back,ankles/feet,and overall body of male employees in the automobile manufacturing industry.Enterprises should improve labor organization,reduce overtime work,and protect the health of workers.
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