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Poor progress during labor (dystocia) is the main indication for primary cesarean delivery. Building on prior observations that the cervix undergoes preparative changes before labor and that women with short cervices are at risk for preterm birth, U.K. investigators conducted a secondary analysis of a multicenter cohort of more than 27,000 primiparous women to assess whether women with long cervices are more likely to require cesarean delivery at term. Participants underwent cervical-length measurement by transvaginal ultrasound examination at a median 23 weeks’ gestation. Pregnancy outcomes were obtained from hospital delivery records.
Longer midpregnancy cervical length was an independent predictor of higher cesarean delivery rates at term…