501: Antenatal Corticosteroids in Early Term Cesarean Sections (ACS ET CS)

Abstract

Hosmer-Lemeshow test was used to demonstrate goodness-of-fit. Model discrimination was evaluated via concordance index and displayed via area under the receiver operator curve (AUC). The developed model was internally validated using the remaining 30% of the cohort to further assess predictive ability. RESULTS: Of the 1,357 women meeting study criteria, 974 (71.8%) had a vaginal delivery following induction. The final model consisted of eight variables, which were significantly associated with mode of delivery following induction, including maternal age, BMI, gestational age, intrapartum magnesium sulfate, need for cervical ripening, prior cesarean delivery, cervical dilation and effacement. Model calibration and discrimination were satisfactory with Hosmer-Lemeshow test p¼0.35 and an AUC (95% CI) of 0.76 (0.73, 0.79). Internal validation demonstrated similar discriminatory ability. CONCLUSION: Using information available prior to labor induction, our model can predict vaginal delivery success for women with hypertensive disorders of pregnancy and may aid in clinical decisionmaking.