About 22 percent of those female workers diagnosed with mental disorders said they experienced or observed a traumatic accident or disaster.
The survey covers approximately 3,000 cases of persons certified as having a mental illness from January 2010 through March 2017, of which women accounted for 31.4 percent.
The survey also analyzed working conditions in the construction and media sectors, notable for their long working hours, between January 2010 and March 2015.
There were 59 cases of mental illness among construction site supervisors.
Related coverage:Sexual harassment toward job-hunting students by alumni widespread in JapanFeminist scholar calls Japan's gender problem "human disaster"Japan's #KuToo movement giving women a leg-up in the workplace