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Findings are inconsistent regarding whether adverse obstetric outcomes are more likely with nighttime delivery. To assess outcomes associated with deliveries during daytime (6 a.m.–8 p.m.) or nighttime (8 p.m.–6 a.m.), investigators studied 7917 cases of postpartum hemorrhage (PPH; blood loss of >500 mL or >1000 mL with vaginal or cesarean delivery, respectively) occurring at 25 academic medical centers. The primary outcome was a composite of maternal morbidity including death, hysterectomy, intensive care admission, transfusion, or other procedure to control hemorrhage (dilation and curettage, intrauterine balloon, uterine packing, B-Lynch suture, or hypogastric or uterine artery ligation).
There was no statistically significant difference …