Estimating the probability of spontaneous delivery conditional on the time spent in the second stage.
D000465:Algorithms; D036861:Delivery, Obstetric; D005260:Female; D006801:Humans; D007748:Labor Stage, Second / Q000502:physiology*; D007743:Labor, Obstetric / Q000502:physiology*; D011247:Pregnancy; D014599:Uterus / Q000502:physiology