Validity and reproducibility of self‐reported working hours among Japanese male employees

Objective Working long hours is a potential health hazard. Although self‐reporting of working hours in various time frames has been used in epidemiologic studies, its validity is unclear. The objective of this study was to examine the validity and reproducibility of self‐reported working hours among Japanese male employees. Methods The participants were 164 male employees of four large‐scale companies in Japan. For validity, the Spearman...