ArticleBirth (Berkeley, Calif.)2020
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.
Article in Birth (Berkeley, Calif.), 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 38 papers, 1 of them a synthesis that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
38 citing papers in PubMed, 1 synthesis or guideline pooled it, 65 citations in OpenAlex.
- Occupational Risk Factors and Hypertensive Disorders in Pregnancy: A Systematic Review.International journal of environmental research and public health · 2021Pooled it
- Biodynamic lighting conditions preserve nocturnal melatonin production in pregnant women during hospitalization: A randomized prospective pilot study.Frontiers in endocrinology · 2022Trial
- Multiple maternal occupational exposures during pregnancy and newborn size at birth: analysis of the ELFE cohort, a French longitudinal study of children.Scandinavian journal of work, environment & health · 2026Article
- Prediction of hypertensive disorders of pregnancy in advanced-age pregnant women using SHAP value and XGBoost.Scientific reports · 2026Article
- Associations Between Late-Night Shift Work and Perinatal Outcomes: A Nationwide Cross-Sectional Study Using JACSIS and JASTIS Data.The journal of obstetrics and gynaecology research · 2026Article
- Association of postpartum weight retentions at 4 weeks with large-for-gestational-age infants in the second pregnancy: the Japan environment and children's study.Journal of diabetes and metabolic disorders · 2025Article
- Low glucose challenge test result as a potential risk factor for delays in early child development: the Japan environment and children's study.Journal of diabetes and metabolic disorders · 2025Article
- Impact of night shift work on women's fertility, pregnancy and menopause.Frontiers in sleep · 2025Review
- Risk factors for resignation from work during pregnancy among Japanese women: a cross-sectional, multicenter questionnaire survey.Industrial health · 2024Article
- Long working hours and obstetric complications: A cross-sectional study among female doctors.European journal of obstetrics & gynecology and reproductive biology: X · 2024Article
- Article
- Multiple Job Holding, Job Changes, and Associations with Gestational Diabetes and Pregnancy-Related Hypertension in the National Birth Defects Prevention Study.International journal of environmental research and public health · 2024Article
- Associations of Night Shift Status During Pregnancy With Small for Gestational Age and Preterm Births.Journal of Korean medical science · 2024Article
- Article
- Prevalence and Predictors of Leg Cramps in the Third Trimester of Pregnancy: A Cross-Sectional Study.International journal of women's health · 2024Article
- Article
- Obesity as a potential risk factor for stillbirth: The Japan Environment and Children's Study.Preventive medicine reports · 2023Article
- Women's Employment in Industries and Risk of Preeclampsia and Gestational Diabetes: A National Population Study of Republic of Korea.Safety and health at work · 2023Article
- A nationwide, prospective, cohort study on exogenous oxytocin and delays in early child development: the Japan environment and children's study.European journal of pediatrics · 2023Article
- Maternal Dietary Zinc Intake during Pregnancy and Childhood Allergic Diseases up to Four Years: The Japan Environment and Children's Study.Nutrients · 2023Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
10 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundThe 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.
methodsThe 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.
resultsCompared 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.
conclusionsWork 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.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.