Wang L, Wang H, Jia L, et al. - Researchers conducted a retrospective cohort study investigating the impact of stage of labor duration on multiparous women. They defined adverse maternal outcomes as referral cesarean delivery, instrumental delivery, postpartum hemorrhage, perineal laceration (III and IV degree), hospitalization stay ≥ 90th, and adverse neonatal outcomes as NICU, shoulder dystocia, Apgar score ≤ 7 (5 min), neonatal resuscitation, assisted ventilation needed immediately following delivery. Among 7,109 included parturients, the duration of first stage was 6.2 (3.6–10.0) hours, the second stage was 0.3 (0.2–0.7) hour, the total stage was 6.9 (4.1–10.7) hours in multiparous women. Observations suggested a correlation of prolonged stage of labor with increased adverse outcomes in multiparous women, as well as its independent value as risk factor of adverse maternal and neonatal outcomes.