Which of the following statements about the effect of early amniotomy on nulliparous labour are true?
D000650:Amnion / Q000601:surgery*; D004420:Dystocia / Q000517:prevention & control*; D005260:Female; D006801:Humans; D007751:Labor, Induced / Q000379:methods*; D010298:Parity; D011247:Pregnancy; D013997:Time Factors