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Neighbourhood Social Vulnerability and Preterm Birth Risk Among Infants With Trisomy 21: A Statewide Analysis
Fatima R Sheriff1, Renata H Benjamin1, Qian Xiao1
1Department of Epidemiology, University of Texas Health Science Center at Houston (UTHealth) School of Public Health, Houston, Texas, USA.
Insights
Maternal residence in socially vulnerable areas increases preterm birth (PTB) risk for infants with trisomy 21. This risk is highest for non-Hispanic Black women, highlighting the need for targeted interventions.
Area of Science:
- Perinatal epidemiology
- Social determinants of health
- Genetics and developmental disorders
Background:
- Socioeconomic vulnerability is linked to higher preterm birth (PTB) rates.
- Infants with trisomy 21 have a disproportionately higher PTB rate.
- The impact of social vulnerability on PTB risk in trisomy 21 infants is not well understood.
Purpose of the Study:
- To investigate the association between maternal socioeconomic vulnerability and PTB in infants with trisomy 21.
- To quantify the risk of PTB based on neighborhood-level Social Vulnerability Index (SVI) quartiles.
Main Methods:
- Retrospective cohort study of infants with trisomy 21 in Texas (1999-2018).
- Utilized the Texas Birth Defects Registry and Social Vulnerability Index (SVI) data.
- Employed Poisson regression to calculate risk ratios (RRs) and 95% confidence intervals (CIs), adjusting for covariates.
Main Results:
- A total of 8823 infants were analyzed; 25.7% were born preterm.
- Living in the highest SVI quartile was associated with increased PTB risk (RR 1.17).
- The association was more pronounced among non-Hispanic Black women (RR 1.44).
Conclusions:
- Neighborhood social vulnerability is a significant factor influencing PTB risk in infants with trisomy 21.
- Findings highlight disparities in perinatal health outcomes for vulnerable populations.
- Addresses a critical gap in understanding PTB risk factors for trisomy 21 infants.
Background:
Residing in socioeconomically vulnerable areas is known to be associated with increased preterm birth (PTB) risk in the general population. However, the relationship between social vulnerability and PTB remains unexplored among infants with trisomy 21, who experience more than twice the PTB rate of the general population.
Objectives:
The primary objective was to examine the association between maternal socioeconomic vulnerability, as measured by the SVI, and PTB among infants with trisomy 21.
Methods:
We conducted a retrospective cohort study among infants with trisomy 21 born in Texas (1999-2018). We examined the association between neighbourhood vulnerability, measured by Social Vulnerability Index (SVI) quartiles, and PTB utilising data from the Texas Birth Defects Registry. Using Poisson regression, we estimated crude and adjusted risk ratios (RRs) and 95% confidence intervals (CIs), accounting for maternal demographic characteristics and health factors.
Results:
Of the 8823 eligible infants included in the analysis, 2269 (25.7%) were born preterm. Maternal residence in the highest vulnerability quartile was associated with an increased risk of PTB (RR 1.17, 95% CI 1.04, 1.32) and moderate to late PTB (RR 1.19, 95% CI 1.05, 1.35), compared to the least vulnerable quartile. In secondary analyses stratified by race/ethnicity, the association with high vulnerability was particularly strong among non-Hispanic Black women (RR 1.44, 95% CI 1.00, 2.07).
Conclusions:
These findings underscore the importance of neighbourhood social vulnerability in influencing perinatal health risks, particularly PTB among infants with trisomy 21.
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