The risk of postterm
pregnancy increased with increasing maternal age and was higher among primiparous women. The risk of cesarean section
(CS) following labor induction postterm, increased with maternal age and BMI, and was more than doubled among women
35 years and older (adjusted OR 2.28, 95% CI 2.04–2.56). A fivefold risk of CS was seen among nulliparous women (adjusted
OR 5.05, 95% CI 4.71–5.42). Parous women with a previous CS undergoing labor induction had a sevenfold increased risk
of CS postterm (adjusted OR 7.19, 95% CI 5.93–8.71). Conclusions. Nulliparity, advanced maternal age and obesity were
the strongest risk factors for postterm pregnancy and CS following labor induction in postterm pregnancy. Including maternal
risk factors to the cervical assessment may improve prediction of vaginal delivery following labor induction in postterm
pregnancy.