Fig. 3.

Survival plot as a function of time from the onset of active labour until caesarean delivery. Event was defined as delivery. Women were censored at the time of vaginal delivery. Adjustments were made for maternal age, height, birth weight, labour induction, augmentation with oxytocin, and epidural analgesia. A hazard ratio (HR) >1 illustrates a shorter duration of labour while a HR <1 illustrates a longer duration of labour compared to the reference group consisting of normal-weight women