A Longitudinal Case Study on the Work-related Musculoskeletal Risk Level between a Main Contractor and Subcontractors

Objective: This study is to investigate the difference of work-related musculoskeletal risk level between a main contractor and subcontractors for fifteen years.BRBackground: Main contractors tended to entrust some processes, especially heavy or cumbersome processes, to their subcontractors for business or management reasons.BRMethod: This study measured and traced; (1) the risk score (frequency × intensity) of KOSHA GUIDE H-9-2022, (2) REBA score and (3) ANSI Z-365 Checklist score between a main contractor and subcontractors for 15 years.BRResults: The risk levels measured by KOSHA GUIDE H-9-2022 and ANSI Z-365 Checklist showed significant difference between a main contractor and subcontractors. There was no difference in case of REBA.BRConclusion: The case study showed significant difference of work-related musculoskeletal risk level between a main contractor and subcontractors.BRApplication: These results could be useful in establishing musculoskeletal prevention policy for main contractors and subcontractors.