1. Spontaneous rupture of membranes (ROM) ≥1 hour prior to starting induction; ROM defined as clinical history with the presence of 2 of the following 4: pooling, ferning, nitrazine, oligohydramnios. In the absence of clinical history, oligohydramnios AND pooling must be present for ROM to be diagnosed. Oligohydramnios is defined as a total amniotic fluid index of <5cm or a maximum vertical pocket <2cm.