LAUSR

intrapartum characteristics found to be statistically significant between obese women with failed IOL and those who delivered vaginally. Using separate models generated for nulliparous and multiparous obese women, receiver operator curves (ROC) were created to assess predictive ability for a failed induction RESULTS: Of the 4,653 obese women, 1,344 (29%) had a failed IOL with the majority being nulliparous 1,022/1,344 (44%). Several maternal and intrapartum characteristics with a failed IOL differed compared to those who delivered vaginally. Nulliparous class III obese women had increased odds of failed IOL (32.3% vs 23% aOR [95% CI] 1.62 [1.31, 2.00] compared to class I obese women. Similarly, multiparous class III obese women had increased odds of failed IOL 36.9% vs 26.9% 1.40 [1.11, 2.00]. Both nulliparous and multiparous class II obese women did not have increased odds of failed IOL compared to class I. Using the above models for nulliparous and multiparous obese women, maternal obesity was not predictive of a failed IOL (ROC area 0.6309 nulliparous, 0.5958 multiparous). CONCLUSION: Over 40% of obese nulliparous women had a failed IOL, with class III obesity increasing the odds of failed IOL. However, obesity is not predictive of failed IOL.