Effectiveness of workers' general health examination in Korea by health examination period and compliance: retrospective cohort study using nationwide data.

A 1-year period of Workers' General Health Examinations in non-office workers had a more significant prevention effect on ischemic heart disease than a 2-year period in office workers among working age (40s-50s) men. It is, however, necessary to consider that prevention of cardio-cerebrovascular disease can be partially explained by their occupational characteristics rather than by health examination period.