ArticleMaternal and child health journal2013
Association between preterm delivery and pre-pregnancy body mass (BMI), exercise and sleep during pregnancy among working women in Southern California.
Article in Maternal and child health journal, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 17 papers, 4 of them syntheses that pooled it.
What it found
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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.
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Who cites it
17 citing papers in PubMed, 4 syntheses or guidelines pooled it, 49 citations in OpenAlex.
- Maternal Occupational Risk Factors and Preterm Birth: A Systematic Review and Meta-Analysis.Public health reviews · 2023Pooled it
- Maternal sleep during pregnancy and adverse pregnancy outcomes: A systematic review and meta-analysis.Journal of diabetes investigation · 2022Pooled it
- Association between maternal sleep duration and quality, and the risk of preterm birth: a systematic review and meta-analysis of observational studies.BMC pregnancy and childbirth · 2020Pooled it
- Non-occupational physical activity during pregnancy and the risk of preterm birth: a meta-analysis of observational and interventional studies.Scientific reports · 2017Pooled it
- Effects of exercise during pregnancy on maternal and newborn outcomes.BMC pregnancy and childbirth · 2025Review
- Lifestyle Modifications Prior to Pregnancy and Their Impact on Maternal and Perinatal Outcomes: A Review.Journal of clinical medicine · 2025Review
- Association between sleep during pregnancy and birth outcomes: a prospective cohort study.Reproductive biology and endocrinology : RB&E · 2025Article
- The Association Between Exercise During Pregnancy and the Risk of Preterm Birth.International journal of women's health · 2024Article
- Association between maternal outdoor physical exercise and the risk of preterm birth: a case-control study in Wuhan, China.BMC pregnancy and childbirth · 2021Article
- Sleep Disturbances and Modulations in Inflammation: Implications for Pregnancy Health.Social and personality psychology compass · 2019Article
- Association Between Fruit and Vegetable Consumption and Sleep Quantity in Pregnant Women.Maternal and child health journal · 2017Article
- Maternal sleep duration and complaints of vital exhaustion during pregnancy is associated with placental abruption.The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians · 2015Article
- Sleep duration, vital exhaustion, and odds of spontaneous preterm birth: a case-control study.BMC pregnancy and childbirth · 2014Article
- Sleep disturbance and cardiometabolic risk factors in early pregnancy: a preliminary study.Sleep medicine · 2014Observational
- A review of maternal overweight and obesity and its impact on cardiometabolic outcomes during pregnancy and postpartum.Therapeutic advances in reproductive healthReview
- Occupational, Environmental, and Lifestyle Factors and their Contribution to Preterm Birth - An Overview.Indian journal of occupational and environmental medicineReview
- Exercise during early pregnancy is associated with greater sleep continuity.Behavioral sleep medicineArticle
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
6 authors at 4 institutions in 1 country.
Funding
Abstract
Little is known about modifiable lifestyle factors beyond quitting smoking that could prevent preterm delivery (PTD, <37 weeks gestation). We examined the individual and joint associations of pre-pregnancy BMI, second trimester exercise and sleep on PTD. We conducted a nested, population-based case-control study interviewing postpartum 344 cases delivering at <37 weeks, as identified by clinical estimate of gestational age from prenatal screening records, and 698 term controls, excluding term low birthweight. Eligible women participated in California's statewide Prenatal Screening Program, worked during pregnancy, and delivered a singleton birth in Southern California in 2002-2003. Modeled separately, moderate (odds ratio [OR] = 0.90; 95% confidence interval [CI] = 0.84-0.96--per hour/week) and vigorous (OR = 0.67; 95% CI = 0.46-0.98 for yes vs. no) exercise during the second trimester were associated with a reduced odds of PTD, and sleep duration was not (OR = 1.09, 95% CI = 0.80-1.48 for <7 h; OR = 0.88, 95% CI = 0.57-1.48 for >8 h vs. 7-8 h). When sleep and exercise variables were modeled together along with pre-pregnancy BMI, only moderate exercise (OR = 0.91; 95% CI 0.85-0.98) continued to be associated with reduced odds of PTD. The benefits of moderate exercise appeared strongest for women with BMI greater than 24 kg/m(2) (OR = 0.85; 95% CI = 0.79-0.93) and weakened with decreasing BMI. No other interactions were found. Moderate exercise is associated with reduced PTD, particularly for women with BMI above the normal range. The results are of public health relevance given that these risk factors are potentially modifiable both pre-conceptionally and during pregnancy and rates of PTD are still high in the United States.
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Registered trials
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