The quantity and quality of scientific evidence about the health of working women in occupational health of Japan: A scoping review

Objective: We aim to investigate the quantity and quality of scientific evidence dealing with comprehensive health issues of working women in occupational health. Methods: This scoping review of original articles that investigated comprehensive health issues of working women aged 19–64 years in Japan was published in PubMed (1967–2022) and Igaku Chuo Zasshi (or Ichu-shi, 1982–2022). Using identical broad search terms, we first identified 17 122 English and 6154 Japanese articles. We excluded those with clinically relevant topics, or ethnicity other than Japanese and included 853 English and 855 Japanese articles for review and classified them into nine research areas considered to be critical factors for women in the workforce and five study design groups to investigate the quality of the evidence accumulated. Results: Among 853 English-language articles in PubMed, “Mental health” was the most frequent area studied, followed by “Work-related disease” and “Lifestyle-related disease.” Among 855 Japanese-language articles from Ichu-shi, “Mental health” was the most frequently studied area followed by “Work and balance,” and “Work-related disease.” “Infertility, pregnancy, and childbirth” and “Menstruation, menopause, and genital disease” were well studied in Ichu-shi but scarcely published in PubMed. “Harassment and discrimination” were sparsely reported in both databases. As for research designs, many articles in both PubMed and Ichu-shi employed descriptive or cross-sectional study designs. However, a few studies employed cohort/longitudinal or interventional studies. Conclusion: The results underscored the need for higher-quality study designs with more scientific evidence on working women's health in the field of occupational health.