Frequency of night shift and menstrual cycle characteristics in Japanese nurses working under two or three rotating shifts.

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 in

SUBMITTER: Mayama M 

PROVIDER: S-EPMC7676323 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature