Fig. 2From: 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 NorwayIllustration of the 4 h action line with an alert line (expected progression) and an action line (labor dystocia if crossed) according to Philpott et al. [27]Back to article page