Logistic regression shows an increased risk of spontaneous preterm and postterm birth after previous cesarean section For the cohort with two consecutive pregnancies ( Fig 3 ), previous CS was associated with a higher risk of spontaneous preterm and postterm birth, with larger effect sizes for intervals further away from term (logistic regression, all p -values highly significant, <0.001).
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Cesarean section and the gestational duration of subsequent pregnancies: A nationwide register-based cohort study.
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