Correlates of Trial of Labor and Vaginal Birth After Cesarean in the United States.

Little is known about trial of labor after cesarean (TOLAC) uptake and vaginal birth after cesarean (VBAC) success on the national level, which is important as national-level data may help shape future clinical guidelines. This study examined correlates of trial of labor and successful VBAC among women with one prior cesarean in the United States in 2016. We used publically available birth certificate data for 2016. Outcomes were TOLAC among women with one prior cesarean ( = 338,311) and VBAC among women with a TOLAC ( = 76,688). We used logistic regression to assess the association between the outcomes and the following categories of independent variables: social determinants of health, demographic and medical factors impacting birth, behavioral factors, and geographic access. About 23% of women had a TOLAC, and 74% of women with a TOLAC gave birth vaginally. Black women had higher odds of TOLAC relative to White women, but lower odds of successful VBAC. Women without a high school degree had higher odds of TOLAC and of successful VBAC compared to women who completed high school or beyond, as did women with inadequate prenatal care utilization. Understanding correlates of TOLAC and successful VBAC at the population level is important for developing national guidelines that can be considered and individualized at the patient/provider level.