Journal article
Risk of early birth by body mass index in a propensity score matched sample: a retrospective cohort study
BJOG : an international journal of obstetrics and gynaecology, Vol.129(10), pp.1704-1711
09/2022
DOI: 10.1111/1471-0528.17120
PMID: 35133077
Abstract
Objective
Evaluate the risk of preterm (<37 weeks) or early term birth (37 or 38 weeks) by body mass index (BMI) in a propensity score-matched sample.
Design
Retrospective cohort analysis.
Setting
California, USA.
Population
Singleton live births from 2011–2017.
Methods
Propensity scores were calculated for BMI groups using maternal factors. A referent sample of women with a BMI between 18.5 and <25.0 kg/m2 was selected using exact propensity score matching. Risk ratios for preterm and early term birth were calculated.
Main outcome measures
Early birth.
Results
Women with a BMI <18.5 kg/m2 were at elevated risk of birth of 28–31 weeks (relative risk [RR] 1.2, 95% CI 1.1–1.4), 32–36 weeks (RR 1.3, 95% CI 1.2–1.3), and 37 or 38 weeks (RR 1.1, 95% CI 1.1–1.1). Women with BMI ≥25.0 kg/m2 were at 1.2–1.4-times higher risk of a birth <28 weeks and were at reduced risk of a birth between 32 and 36 weeks (RR 0.8–0.9) and birth during the 37th or 38th week (RR 0.9).
Conclusion
Women with a BMI <18.5 kg/m2 were at elevated risk of a preterm or early term birth. Women with BMI ≥25.0 kg/m2 were at elevated risk of a birth <28 weeks. Propensity score-matched women with BMI ≥30.0 kg/m2 were at decreased risk of a spontaneous preterm birth with intact membranes between 32 and 36 weeks, supporting the complexity of BMI as a risk factor for preterm birth.
Details
- Title: Subtitle
- Risk of early birth by body mass index in a propensity score matched sample: a retrospective cohort study
- Creators
- Rebecca J Baer - The California Preterm Birth Initiative, University of California San Francisco, San Francisco, CA, USABrittany D Chambers - Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, CA, USAKimberly Coleman-Phox - Department of Obstetrics, Gynecology and Reproductive Sciences, University of California, San Francisco, CA, USAElena Flowers - Departments of Nursing and Institute for Human Genomics, University of California, San Francisco, USAJonathan D Fuchs - San Francisco Department of Public Health, San Francisco, CA, USAScott P Oltman - Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, CA, USAKaren A Scott - The California Preterm Birth Initiative, University of California San Francisco, San Francisco, CA, USAKelli K Ryckman - Departments of Epidemiology and Pediatrics, University of Iowa, Iowa City, IA, USALarry Rand - Department of Obstetrics, Gynecology and Reproductive Sciences, University of California, San Francisco, CA, USALaura L Jelliffe-Pawlowski - Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, CA, USA
- Resource Type
- Journal article
- Publication Details
- BJOG : an international journal of obstetrics and gynaecology, Vol.129(10), pp.1704-1711
- DOI
- 10.1111/1471-0528.17120
- PMID
- 35133077
- NLM abbreviation
- BJOG
- ISSN
- 1470-0328
- eISSN
- 1471-0528
- Publisher
- Wiley
- Language
- English
- Electronic publication date
- 02/08/2022
- Date published
- 09/2022
- Academic Unit
- Stead Family Department of Pediatrics; Epidemiology
- Record Identifier
- 9984216626902771
Metrics
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