ArticleBMC pregnancy and childbirth2019
Maternal obesity classes, preterm and post-term birth: a retrospective analysis of 479,864 births in England.
Article in BMC pregnancy and childbirth, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 24 papers, 2 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.
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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
24 citing papers in PubMed, 2 syntheses or guidelines pooled it.
- FIGO good practice recommendations on preconception care: A strategy to prevent preterm birth.International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics · 2025Guideline
- Pooled it
- Plasma Microrna Profiling in Overweight and Obese Pregnant Women: An Exploratory Pooled-Sample Study.Balkan journal of medical genetics : BJMG · 2026Article
- Intersectoral interventions: integration for impact on preterm birth.Reproductive health · 2025Article
- Article
- Impact of pre-pregnancy weight on the risk of premature rupture of membranes in Chinese women.Heliyon · 2023Article
- No strong evidence of the protein leverage hypothesis in pregnant women with obesity and their infants.Obesity (Silver Spring, Md.) · 2023Article
- Nomogram for predicting the risk of preterm birth in women undergoing in vitro fertilization cycles.BMC pregnancy and childbirth · 2023Article
- Association of Pre-Pregnancy Obesity and COVID-19 with Poor Pregnancy Outcome.Journal of clinical medicine · 2023Article
- Association of serum leptin at 24-28 weeks gestation with initiation and progression of labor in women.Scientific reports · 2022Article
- The amniotic fluid proteome predicts imminent preterm delivery in asymptomatic women with a short cervix.Scientific reports · 2022Article
- Does Maternal Obesity Affect Preterm Birth? Documentary Cohort Study of Preterm in Firstborns-Silesia (Poland).Children (Basel, Switzerland) · 2022Article
- Article
- Obesity Class Impacts Adverse Maternal and Neonatal Outcomes Independent of Diabetes.Frontiers in endocrinology · 2022Article
- Urban-rural differences in the association between social activities and depressive symptoms among older adults in China: a cross-sectional study.BMC geriatrics · 2021Article
- Determinants of Psychosocial Resilience Resources in Obese Pregnant Women with Threatened Preterm Labor-A Cross-Sectional Study.International journal of environmental research and public health · 2021Article
- Article
- Pregnancy after Bariatric Surgery: A Nested Case-Control Study of Risk Factors for Small for Gestational Age Babies inNutrients · 2021Article
- Article
- Effect of Excessive Body Weight and Emotional Disorders on the Course of Pregnancy and Well-Being of a Newborn before and during COVID-19 Pandemic.Journal of clinical medicine · 2021Article
Corrections and comments
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Authors and funding
4 authors.
Funding
Abstract
backgroundPreterm (< 37 weeks gestation) and post-term birth (≥42 weeks gestation) are associated with increased morbidity and mortality for mother and infant. Obesity (body mass index (BMI) ≥30 kg/m
methodsA secondary data analysis of 13 maternity units in England with information on 479,864 singleton live births between 1990 and 2007. BMI categories were: underweight (< 18.5 kg/m
resultsThere was a J-shaped association between the absolute risk of extreme, very and moderate preterm birth and BMI category, with the greatest effect size for extreme preterm. The absolute risk of post-term birth increased monotonically as BMI category increased. The largest effect sizes were observed for class IIIb obesity and extreme preterm birth (adjusted OR 2.80, 95% CI 1.31-5.98).
conclusionWomen with class IIIb obesity have the greatest risks for inadequate gestational age. Combining obesity classes does not accurately represent risks for many women as it overestimates the risk of all preterm and post-term categories for women with class I obesity, and underestimates the risk for women in all other obesity classes.
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