Time trends in prevalence of gastroschisis in Texas, 1999-2011: Subgroup analyses by maternal and infant characteristics

Loc-Uyen T Vo, The University of Texas School of Public Health


Background: The prevalence of gastroschisis, a birth defect of the abdominal wall, has been increasing in several areas around the world. Suggested risk factors for gastroschisis include maternal age, race/ethnicity, nativity, body mass index (BMI), and socioeconomic status (SES). Methods: Data for cases of gastroschisis and live births were taken from the Texas Birth Defects Registry (TBDR) and Texas vital records for deliveries between 1999-2011. Prevalence by subgroups over time was calculated for: infant sex, maternal age, race/ethnicity, nativity, education, parity, plurality, BMI, and payer type. Stratified, adjusted, and interaction analyses of the trends were conducted using Poisson regression. Results: A total of 2,549 gastroschisis cases and 4,970,979 live births were delivered in 1999-2011, for an overall prevalence of 5.13 cases per 10,000 live births (95% confidence interval (CI) = 4.93–5.33). On average, the prevalence increased 4.8% each year; this overall time trend was statistically significant (p-value < .0001). The time trend remained significant after adjusting for all variables, except payer type. The stratified analysis showed the increasing time trend was significant in many of the subgroups. However, there were no significant differences in the magnitude of the time trends between subgroups according to the interaction analysis. Conclusions: This study confirms the increasing prevalence of gastroschisis over the time period 1999-2011 in Texas. The results suggest that no population subgroups are experiencing a significantly different increase in gastroschisis prevalence over time than others.

Subject Area

Biostatistics|Public health|Ethnic studies|Epidemiology

Recommended Citation

Vo, Loc-Uyen T, "Time trends in prevalence of gastroschisis in Texas, 1999-2011: Subgroup analyses by maternal and infant characteristics" (2015). Texas Medical Center Dissertations (via ProQuest). AAI1597644.