Michinori Mayama1, Takeshi Umazume1, Hidemichi Watari1, Sho Nishiguchi2, Takuhiro Moromizato3, Takashi Watari4. 1. Department of Obstetrics and Gynecology, Hokkaido University Graduate School of Medicine, Sapporo, Japan. 2. Department of General Internal Medicine, Shonan Kamakura General Hospital, Kamakura, Japan. 3. Renal & Rheumatology Division, Internal Medicine Department, Okinawa Prefectural Nanbu Medical Center and Children's Medical Center, Haebaru-cho, Japan. 4. Post Clinical Training Center, Shimane University Hospital, Izumo, Japan.
Abstract
OBJECTIVES: In Japan, the prevalence of irregular menstrual cycles and its association with the frequency of night shifts have scarcely assessed. The present study aimed to evaluate the relationship between irregular menstrual cycles and the frequency of night shifts in Japanese female nurses. METHODS: We conducted a cross-sectional web-based self-administered questionnaire survey in 2019. An irregular menstrual cycle was defined as a cycle length of ≤21 days or ≥39 days at least a few times over the past year or amenorrhea for at least 3 months. We used Poison regression analysis with a robust error variance to calculate the prevalence ratios adjusted for age, body mass index, hospital size, and the department in which they worked. RESULTS: A total of 1249 women were included, and 679 (54.4%) and 195 (15.6%) of them worked under two and three rotating shifts. The prevalence of irregular menstrual cycles was 24.8%, 37.4%, and 35.9% in the no night, two rotating, and three rotating shifts groups, respectively. While the frequency of night shifts had a dose-responsive relationship with irregular menstrual cycles in the two rotating shifts group, it was not observed in the three rotating shifts group. However, the risk of work getting affected by dysmenorrhea or premenstrual symptoms increased in the three rotating shifts group. CONCLUSIONS: Over 30% of Japanese female nurses working under night shifts had irregular menstrual cycles. The high frequency of night shifts increased the risk of irregular menstrual cycles and secondary amenorrhea in the two rotating shifts group.
OBJECTIVES: In Japan, the prevalence of irregular menstrual cycles and its association with the frequency of night shifts have scarcely assessed. The present study aimed to evaluate the relationship between irregular menstrual cycles and the frequency of night shifts in Japanese female nurses. METHODS: We conducted a cross-sectional web-based self-administered questionnaire survey in 2019. An irregular menstrual cycle was defined as a cycle length of ≤21 days or ≥39 days at least a few times over the past year or amenorrhea for at least 3 months. We used Poison regression analysis with a robust error variance to calculate the prevalence ratios adjusted for age, body mass index, hospital size, and the department in which they worked. RESULTS: A total of 1249 women were included, and 679 (54.4%) and 195 (15.6%) of them worked under two and three rotating shifts. The prevalence of irregular menstrual cycles was 24.8%, 37.4%, and 35.9% in the no night, two rotating, and three rotating shifts groups, respectively. While the frequency of night shifts had a dose-responsive relationship with irregular menstrual cycles in the two rotating shifts group, it was not observed in the three rotating shifts group. However, the risk of work getting affected by dysmenorrhea or premenstrual symptoms increased in the three rotating shifts group. CONCLUSIONS: Over 30% of Japanese female nurses working under night shifts had irregular menstrual cycles. The high frequency of night shifts increased the risk of irregular menstrual cycles and secondary amenorrhea in the two rotating shifts group.
Authors: Jin Ju Kim; Young Min Choi; Min A Hong; Soo Jin Chae; Kyuri Hwang; Sang Ho Yoon; Seung Yup Ku; Chang Suk Suh; Seok Hyun Kim Journal: J Assist Reprod Genet Date: 2017-05-25 Impact factor: 3.412