Korea Nurses’ Health Study and the health of reproductive-aged women: a cohort profile

The Korea Nurses’ Health Study (KNHS) is an ongoing, large-scale, prospective cohort study of women nurses, focusing on the effects of occupational, environmental, and lifestyle factors on the health of women. The first KNHS survey was performed in 2013-2014 (n = 20,613). As of December 2023, 11 follow-up surveys have been conducted. Participants who were pregnant were asked to participate in the early pregnancy survey (n = 2,179) and postpartum survey after giving birth (n = 2,790). The main variables included socio-demographic, work-related, lifestyle, physical, mental, and women’s health factors. Blood, urine, and toenail samples were collected from a participant subgroup of the first survey (n = 1,983). The subgroups of the second survey completed a food frequency questionnaire in 2019 (n = 300) and 2021 (n = 871). In 2020, a subgroup of the first survey answered a coronavirus disease 2019-related survey (n = 975). To examine various health-related factors in young adults, new participants were added to the KNHS cohort in the 11th (n = 1,000) and 12th (n = 1,002) surveys. The KNHS cohort will help identify health and illness determinants in Korean women. Data can be accessed at https://coda.nih.go.kr/frt/index.do.