Freret TS, Woods GT, James KE, et al. - The incidence of failed induction of labor and the associated patient risk factors were determined via performing a case–control study from a cohort of nulliparous women who delivered between 39 and 41 weeks of gestation after an induction of labor in one of seven hospitals. An induction of labor was performed in 4,123 of 10,175 nulliparous women (40.5%) across the hospitals. Of these, 82 had a failed induction of labor (2.0%). Researchers selected a total of 328 women for the matched control group. Overall findings suggest infrequent occurrence of failed induction of labor. Shorter height, BMI 40 or higher, and cervical dilatation of less than 2 cm on admission are the identified risk factors. However, failed labor induction did not occur in most women with these risk factors.