Fig. 1From: Study protocol: the Labor Progression Study, LAPS - does the use of a dynamic progression guideline in labor reduce the rate of intrapartum cesarean sections in nulliparous women? A multicenter, cluster randomized trial in NorwayLabor progression curve in first time mothers presented in cervical dilatation. Zhang [28]. Reprinted with permission from Elsevier and Copyright Clearance Center (4104651193)Back to article page