Effects of long working hours and shift work during pregnancy on obstetric and perinatal outcomes: A large prospective cohort study-Japan Environment and Children's Study.
Adolescent
Adult
Diabetes, Gestational
/ epidemiology
Female
Humans
Infant, Newborn
Infant, Small for Gestational Age
Japan
/ epidemiology
Logistic Models
Maternal Age
Middle Aged
Obstetric Labor Complications
/ epidemiology
Pre-Eclampsia
/ epidemiology
Pregnancy
Pregnancy Complications
/ epidemiology
Pregnancy Outcome
/ epidemiology
Premature Birth
/ epidemiology
Prospective Studies
Shift Work Schedule
Stillbirth
/ epidemiology
Work Schedule Tolerance
Young Adult
complications
fetal growth
night shifts
pregnancy
working time
Journal
Birth (Berkeley, Calif.)
ISSN: 1523-536X
Titre abrégé: Birth
Pays: United States
ID NLM: 8302042
Informations de publication
Date de publication:
03 2020
03 2020
Historique:
received:
07
04
2019
revised:
02
10
2019
accepted:
02
10
2019
pubmed:
2
11
2019
medline:
21
1
2021
entrez:
1
11
2019
Statut:
ppublish
Résumé
The work patterns of pregnant women may be related to adverse obstetric and perinatal outcomes. This study aimed to clarify the effects of weekly working time according to frequencies of night shifts during pregnancy on adverse outcomes in Japan. The Japan Environment and Children's Study, a prospective cohort study, was conducted in 15 regions nationwide in Japan. The study population included pregnant women with singleton pregnancies (n = 99 744). The mothers' working hours and frequencies of night shifts during the first and the second/third trimesters were assessed using a self-administered questionnaire. Outcome data were collected from medical transcripts. Compared with nonworking women, women who worked during pregnancy had significantly increased adjusted odds ratios (aORs) of threatened miscarriage (maximum aOR: 1.47, 95% confidence interval [95% CI]: 1.26-1.73) and of threatened preterm labor (maximum aOR: 1.63, 95% CI: 1.41-1.87). Increased aORs were observed for hypertensive disorders of pregnancy (maximum aOR: 2.02, 95% CI: 1.39-2.93) in women working ≥36 hours per week with night shifts, for vacuum/forceps delivery (maximum aOR: 1.34, 95% CI: 1.22-1.48) at ≥36 hours with or without night shifts, and for small-for-gestational-age babies (aOR: 1.32, 95% CI: 1.10-1.59) at ≥46 hours with night shifts. In contrast, lower aORs were observed for gestational diabetes and meconium-stained amniotic fluid in women working without night shifts. Work during pregnancy slightly increased the risks of threatened miscarriage and threatened preterm labor. Long working hours increased the risks of hypertensive disorders of pregnancy, vacuum/forceps delivery, and small-for-gestational-age babies.
Sections du résumé
BACKGROUND
The work patterns of pregnant women may be related to adverse obstetric and perinatal outcomes. This study aimed to clarify the effects of weekly working time according to frequencies of night shifts during pregnancy on adverse outcomes in Japan.
METHODS
The Japan Environment and Children's Study, a prospective cohort study, was conducted in 15 regions nationwide in Japan. The study population included pregnant women with singleton pregnancies (n = 99 744). The mothers' working hours and frequencies of night shifts during the first and the second/third trimesters were assessed using a self-administered questionnaire. Outcome data were collected from medical transcripts.
RESULTS
Compared with nonworking women, women who worked during pregnancy had significantly increased adjusted odds ratios (aORs) of threatened miscarriage (maximum aOR: 1.47, 95% confidence interval [95% CI]: 1.26-1.73) and of threatened preterm labor (maximum aOR: 1.63, 95% CI: 1.41-1.87). Increased aORs were observed for hypertensive disorders of pregnancy (maximum aOR: 2.02, 95% CI: 1.39-2.93) in women working ≥36 hours per week with night shifts, for vacuum/forceps delivery (maximum aOR: 1.34, 95% CI: 1.22-1.48) at ≥36 hours with or without night shifts, and for small-for-gestational-age babies (aOR: 1.32, 95% CI: 1.10-1.59) at ≥46 hours with night shifts. In contrast, lower aORs were observed for gestational diabetes and meconium-stained amniotic fluid in women working without night shifts.
CONCLUSIONS
Work during pregnancy slightly increased the risks of threatened miscarriage and threatened preterm labor. Long working hours increased the risks of hypertensive disorders of pregnancy, vacuum/forceps delivery, and small-for-gestational-age babies.
Identifiants
pubmed: 31667913
doi: 10.1111/birt.12463
pmc: PMC7065104
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
67-79Informations de copyright
© 2019 The Authors. Birth published by Wiley Periodicals, Inc.
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