Observational studyBJOG : an international journal of obstetrics and gynaecology2025
Neighbourhood Socioeconomic Disadvantage and Severe Maternal Morbidity: Secondary Analysis of a Prospective Cohort.
Observational study in BJOG : an international journal of obstetrics and gynaecology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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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
2 citing papers in PubMed.
- Severe Maternal Morbidity and Breastfeeding Among Nulliparous Individuals in the United States.Obstetrics and gynecology · 2026Article
- Area deprivation, social vulnerability, and post-pregnancy blood pressure.medRxiv : the preprint server for health sciences · 2026Article
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Authors and funding
16 authors.
Funding
Abstract
objectiveTo examine whether neighbourhood socioeconomic disadvantage, as measured by the Area Deprivation Index (ADI) in early pregnancy, was associated with severe maternal morbidity (SMM) at delivery hospitalisation.
designA prospective multi-site observational cohort.
settingA secondary analysis of the Nulliparous Pregnancy Outcomes Study: Monitoring Mothers-To-Be study (nuMoM2b) across eight United States (US) sites from 2010 to 2013. STUDY
designParticipant residential address in the first trimester was geocoded at the US census-tract level to calculate the ADI, a standardised metric of neighbourhood socioeconomic disadvantage. We used modified Poisson regression with robust error variance and adjusted for individual-level covariates: age, pre-pregnancy body mass index, chronic hypertension, and pregestational diabetes to examine the association between the ADI [modelled in quartiles from the least (quartile 1, Q1, reference) to the most (Q4) disadvantage] and SMM. Differences in the association between ADI and SMM by self-reported race and ethnicity as a social construct were evaluated with effect modification via an interaction term in the adjusted model. MAIN OUTCOMES: SMM, based on the US Centers for Disease Control and Prevention definition, and secondarily, SMM without transfusion.
resultsAmong 9588 nulliparas, 2.3% (n = 221) experienced any SMM and 0.5% (n = 48) experienced non-transfusion SMM. Individuals living in the most disadvantaged neighbourhoods (Q4) were more likely to experience SMM compared with those in the least disadvantaged neighbourhoods (Q1) (3.4% vs. 2.1%; aRR 1.73; 95% CI: 1.17, 2.58). This association was also significant for non-transfusion SMM (1.0% vs. 0.3%; aRR: 2.82; 95% CI 1.15, 6.93). Individuals who self-identified as non-Hispanic Black were more likely to experience SMM than non-Hispanic White individuals (3.9% vs. 2.1%; p < 0.001). There was no evidence of effect modification by self-reported race and ethnicity (interaction p > 0.05).
conclusionNulliparous pregnant individuals who lived in the most disadvantaged US neighbourhoods were at increased risk of experiencing SMM. Known racial and ethnic disparities in SMM may be related to adverse neighbourhood-level social determinants.
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