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VOLUME 51 | NUMBER 5 | OCTOBER 2016


The Effect of Clinical Chorioamnionitis on Cesarean Delivery in the United States

Objective: To examine the association of clinical chorioamnionitis on cesarean delivery in a national sample of hospital discharges.

Data Source: Hospital discharge data from the 1998–2010 Nationwide Inpatient Sample.

Study Design: We performed a cross-sectional study and general linear modeling was used to determine the association of clinical chorioamnionitis on risk of cesarean delivery.

Principal Findings: A total of 10,843,682 deliveries and 51,799,431 nationally weighted deliveries were identified. Clinical chorioamnionitis was present in 2.9 percent of cesarean and 1.3 percent of vaginal deliveries (p < .001). In multivariate analysis, clinical chorioamnionitis was associated with a 1.39-fold increased risk of cesarean delivery. Compared with women without clinical chorioamnionitis at an urban/teaching hospital, women with clinical chorioamnionitis at an urban/teaching, urban/nonteaching, and rural hospital were 1.4–1.5 times more likely to have cesarean delivery. Compared with women without clinical chorioamnionitis in the Midwest, the relative risk for cesarean in women with clinical chorioamnionitis was 1.54 for women in the South, 1.47 in the Northeast, 1.39 in the Midwest, and 1.34 in the West.

Conclusions: Women with clinical chorioamnionitis were more likely to have cesarean delivery than those without clinical chorioamnionitis, and the risk of cesarean delivery varied significantly by hospital location, teaching status, and U.S. region.

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