Crude and adjusted comparisons of cesarean delivery rates using the Robson classification

The authors conducted a population-based cohort study including 1,951,984 deliveries in Sweden and British Columbia, Canada, from 2004 to 2016, with data obtained from national and provincial birth registers. They assessed differences in caesarean delivery rates between countries and over time using the WHO-endorsed caesarean delivery classification. They compared these differences in caesarean delivery rates with and without accounting for population differences in maternal, fetal, and obstetric practice factors, such as maternal age, maternal body-mass-index, fetal weight and fetal position.