Ashwal E, Livne MY, Benichou JIC, et al. - Using contemporary labor charts, researchers sought to explore labor patterns in a large obstetric population (2011-2016). From electronic medical records of live singleton deliveries at term (≥ 37 weeks), they included data of 35,146 deliveries. Of these, 15,948 (45.3%) were of nulliparous. Nulliparous and multiparous women did not differ significantly in median (IQR) cervical dilation at admission (4(3-5) vs 4(3-6) cm). Vaginal delivery occurred in 99.3%. The median (IQR) and 95th centile duration of the 1st stage were 274 (145-441) and 747.5 minutes, respectively, for nulliparous and 133 (56-244) and 494 minutes, respectively for multiparous women. In nulliparous, the time elapsed to the 2nd stage was 120-140 minutes longer during the latent phase (cervical dilation at admission ≤ 4cm), while the gap between the groups decreased dramatically with advanced cervical dilation upon admission. During the latent phase, progression at a similar pace was observed in nulliparas and multiparas, however, it accelerated faster after 5 cm labor in multiparas. In all parities, duration of 1st and 2nd stages lengthened with epidural anesthesia. They proposed partograms according to cervical dilation at presentation.