The effect of subcontractor status on occupational injury and disease incidence: a cross-sectional study using the 9th Occupational Safety and Health Company Survey.

This study confirmed the increased risk of occupational injuries and diseases for subcontractors, whether located inside or outside the contractor workplace (1.66-fold and 1.39-fold increased risk, respectively). Future individual-based epidemiologic studies such as case-control and cohort studies could provide more detailed information such as specific risk factors associated with subcontracted works and confounders according to industry classification.