Objective
To examine whether racial and ethnic differences exist in the
frequency of and indications for cesarean delivery and to assess whether
application of labor management strategies intended to reduce cesarean
delivery rates is associated with patient’s race and ethnicity.
Methods
This is a secondary analysis of a multicenter observational obstetric
cohort. Trained research personnel abstracted maternal and neonatal records
of >115,000 pregnant women from 25 hospitals (2008–2011).
Term women with singleton, nonanomalous, vertex, liveborn neonates were
included in two cohorts: 1) nulliparous women (n=35,529) and 2) multiparous
women with prior vaginal deliveries only (n=39,871). Women were grouped as
non-Hispanic black, non-Hispanic white, Hispanic, and Asian. Multivariable
logistic regression was used to evaluate the following outcomes: overall
cesarean delivery frequency, indications for cesarean delivery, and
utilization of labor management strategies intended to safely reduce
cesarean delivery.
Results
A total of 75,400 women were eligible for inclusion, of whom
47% (N=35,529) were in the nulliparous cohort and 53%
(N=39,871) in the multiparous cohort. The frequencies of cesarean delivery
were 25.8% among nulliparous women and 6.0% among
multiparous women. For nulliparous women, the unadjusted cesarean
frequencies were 25.0%, 28.3%, 28.7%, and
24.0% for non-Hispanic white, non-Hispanic black, Asian, and
Hispanic women, respectively. Among nulliparous women, the adjusted odds of
cesarean were higher in all racial and ethnic groups compared with
non-Hispanic white women (non-Hispanic black aOR 1.47, 95% CI
1.36–1.59; Asian aOR 1.26, 95% CI 1.14–1.40;
Hispanic aOR 1.17, 95% CI 1.07–1.27), due to greater odds of
cesarean delivery both for nonreassuring fetal status and labor dystocia.
Nonapplication of labor management strategies regarding failed induction,
arrest of dilation, arrest of descent, or cervical ripening did not
contribute to increased odds of cesarean delivery for non-Hispanic black and
Hispanic women. Compared with non-Hispanic white, Hispanic women were
actually less likely to experience elective cesarean (aOR 0.60, 95%
CI 0.42–0.87) or cesarean for arrest of dilation prior to 4 hours
(aOR 0.67, 95% CI 0.49–0.92). Additionally, compared with
non-Hispanic white, Asian women were more likely to experience cesarean for
nonreassuring fetal status (aOR 1.29, 95% CI 1.09–1.53) and
to have had that cesarean be performed in the setting of a 1-minute Apgar
score ≥7 (aOR 1.79, 95% CI 1.07–3.00). A similar
trend was seen among multiparous women with prior vaginal deliveries.
Conclusions
Although racial and ethnic disparities exist in the frequency of
cesarean delivery, differential use of labor management strategies intended
to reduce the cesarean delivery rate does not appear to be associated with
these racial–ethnic disparities.