ABSTRACT
OBJECTIVES: We assessed the impact of obesity and racial disparities on preterm birth (PTB) in the United States and sought to determine whether obesity widens the racial-ethnic disparity gap in preterm birth with a focus on non-Hispanic Black and White women. METHODS: Using birth data for the years 2014-2019 made publicly available by the Centers for Disease Control and Prevention and obtained from the National Vital Statistics System, we conducted a cross-sectional cohort study analyzing a total of 14,864,844 births from 2014 to 2019. RESULTS: We observed dose-dependent changes in obesity and PTB by defining obesity in subgroups and PTB in a stratified method. PTB occurred more among non-Hispanic Black women than their non-Hispanic White and Hispanic counterparts. We observed a consistent trend of increased PTB among women with high body mass index. Racial disparity existed in PTB among pregnant obese women, with non-Hispanic Black women exhibiting the greatest risk for PTB. CONCLUSIONS: Our work further contributes to the growing knowledge of the existence of health disparity among the Black population.