Prediction of intrapartum caesarean section in vaginal breech birth: development of models for nulliparous and multiparous women

Our prediction models show the most relevant risk factors associated with intrapartum cesarean section in vaginal breech birth for both nulliparous and multiparous women. Importantly, this study clarifies the role of the OC by showing that this parameter is only associated with intrapartum cesarean section if birthweight is above 3.8 kg (or abdominal circumference is above 34 cm). Conversely, knowing the OC when the birthweight is less than 3.8 kg (or abdominal circumference is less than 34 cm) did not improve prediction of this surgical outcome.