Do intercontraction intervals predict when a woman at term should seek evaluation of labor?

Abstract

A reduction in the intercontraction interval is associated with active labor (strength of recommendation [SOR]: B, cohort study). Most primigravidas who have had regular contractions for 2 hours and multigravidas who have had regular contractions for 1 hour haven't transitioned into the active phase of labor (SOR: B, cohort study).