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Shift work, long working hours, and physical labour in relation to menstrual function: the Nurses' Health Study 3.

Authors
Lawson-C; Johnson-C; Chavarro-J; Hibert-EL; Whelan-E; Rocheleau-C; Grajewski-B; Schernhammer-E; Rich-Edwards-J
Source
Occup Environ Med 2014 Jun; 71(Suppl 1):A13
NIOSHTIC No.
20044623
Abstract
Objectives: We investigated associations between nursing occupational exposures and menstrual cycle regularity and cycle length. Method: Cross-sectional data were collected in 2010-2012 from 6309 nurses aged 21 to 45 from the Nurses' Health Study 3. We used multivariable regression modelling to analyse the associations between occupational exposures and prevalence of irregular cycles and long and short cycle lengths. Results: Cycle length was recorded as <21 days (1.5%), 21-25 days (15.6%), 26-31 days (69.7%), and 32-50 days (13.2%). In addition, 19% of participants reported irregular cycles. Working more than 41 h/week was associated with a 16% [95% confidence interval (CI): 4-29%] higher prevalence of irregular cycles and a higher prevalence of very short (<21 day) cycles [prevalence odds ratio (OR) 1.93, 95% CI: 1.24-3.01]. Irregular menstrual cycles were more prevalent among women working nights only (32% higher) or rotating nights (27% higher), and their prevalence was associated with the number of night shifts per month (p for trend <0.0001). Rotating night shift was also associated with long (32-50 day) cycles (OR 1.28, 95% CI 1.03-1.61). In addition, heavy lifting was associated with a higher prevalence of irregular cycles (34% higher), and the prevalence of cycles <21 days and 21-25 day cycles increased with increasing amount of heavy lifting at work (p for trend <0.02 for each endpoint). Conclusions: Night work, long working hours, and occupational physical labour might play a role in menstrual function disturbances.
Keywords
Humans; Women; Workers; Work-environment; Exposure-levels; Nurses; Age-groups; Models; Statistical-analysis; Menstrual-disorders; Shift-work; Shift-workers; Physiological-effects; Physical-reactions; Manual-lifting
CODEN
OEMEEM
Publication Date
20140601
Document Type
Abstract
Fiscal Year
2014
NTIS Accession No.
NTIS Price
Identifying No.
M072014
ISSN
1351-0711
NIOSH Division
DSHEFS
Priority Area
Healthcare and Social Assistance
Source Name
Occupational and Environmental Medicine
State
OH; MA
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