Department of Occupational and Environmental Medicine, Dong-A University College of Medicine, Busan, Korea.
Department of Occupational and Environment Medicine, Catholic University of Korea College of Medicine, Seoul, Korea.
BMJ Open. 2022 May 13;12(5):e055186. doi: 10.1136/bmjopen-2021-055186.
This study explores the interaction between ergonomic risk factors and long working hours on musculoskeletal symptoms by additive and multiplicative scales.
We used the data of the fifth Korean Working Condition Survey (KWCS). The KWCS is a cross-sectional study.
To represent the entire Korean working population, the probability proportion stratified cluster sampling method was used. The face-to-face interview was carried out with a structured questionnaire.
To assess the combined effect of ergonomic risk factors and long working hours on musculoskeletal symptoms, the relative excess risk due to interaction (RERI) and the ratio of ORs were calculated using multiple survey-weighted logistic analysis and postestimation commands.
The OR for musculoskeletal symptoms was 1.75 (95% CI 1.28 to 1.39) for exposure to long working hours, 3.49 (95% CI 3.06 to 3.99) for exposure to ergonomic risk factors and 5.07 (95% CI 4.33 to 5.93) for coexposure to long working hours and ergonomic risk factors. The RERI was 0.82 (95% CI 0.11 to 1.53) and the ratio of ORs was 0.83 (95% CI 0.50 to 1.14) CONCLUSION: Our findings suggest that coexposure to both ergonomic risk factors and long working hours has a supra-additive interaction effect on musculoskeletal symptoms. Regulations on working hours and workplace interventions might reduce the musculoskeletal diseases of workers.
本研究通过加性和乘法尺度探讨了人体工程学风险因素与长时间工作对肌肉骨骼症状的相互作用。
我们使用了第五次韩国工作条件调查（KWCS）的数据。KWCS 是一项横断面研究。
为了代表整个韩国劳动人口，采用了概率比例分层聚类抽样方法。通过面对面的结构化问卷访谈进行。
为了评估人体工程学风险因素和长时间工作对肌肉骨骼症状的综合影响，使用多调查加权逻辑分析和后估计命令计算了交互的相对超额风险（RERI）和 OR 比。
暴露于长时间工作的肌肉骨骼症状的 OR 为 1.75（95%CI 1.28 至 1.39），暴露于人体工程学风险因素的 OR 为 3.49（95%CI 3.06 至 3.99），同时暴露于长时间工作和人体工程学风险因素的 OR 为 5.07（95%CI 4.33 至 5.93）。RERI 为 0.82（95%CI 0.11 至 1.53），OR 比为 0.83（95%CI 0.50 至 1.14）。
我们的研究结果表明，人体工程学风险因素和长时间工作的共同暴露对肌肉骨骼症状具有超相加的相互作用。关于工作时间的法规和工作场所干预措施可能会减少工人的肌肉骨骼疾病。
