Fig. 1

Nomogram predicting risk of cesarean delivery undergoing induction of labor among nulliparous women at term. For a given patient, points are assigned to each of the variables using the point axis at the top of the figure and a total score is derived. The total points correspond to a predicted probability of cesarean delivery after induction of labor at term. For example, a nulliparous woman of 30 years (26 points) with hypertensive disorder (22 points) is in her 37th week of pregnancy. Height of the patient is 155 cm (63 points), with 30 cm (6 points) of uterine height and 100 cm (26 points) of abdominal circumference, and the estimated fetal weight is 3000 g (18 points). The cervical condition is unfavorable [consistency, firm (21 points); station, − 3 (17 points); effacement (%), 0-30 (56)]. The total point reaches 255, with an estimated probability of cesarean delivery of 78% after induction of labor