Son M, Lai Y, Bailit J, et al. - Experts aspired to explore if the decision and indications for performing intrapartum cesarean delivery differ by time of day [defined as cesarean delivery decision time among those who delivered by cesarean and delivery time among those who delivered vaginally, categorized by each hour of a 24-hour day]. They performed a secondary analysis of a multicenter observational cohort of 115,502 deliveries (2008–2011), involving nulliparous women with term, singleton, nonanomalous live gestations in vertex presentation who were attempting labor. Excluded were those who attempted home birth, or had cesarean delivery scheduled or decided less than 30 minutes after admission. According to results, 7,956 of 36,014 eligible women had cesarean delivery. The decision to perform cesarean delivery, especially for dystocia, varied with the time of day among nulliparous women who attempted labor at term. Some of these differences correlate with differences in labor management, given the changing frequency of cesarean latent phase delivery and median active phase time.