[Evolution of cesarean section rates according to Robson classification in a swiss maternity hospital].

We conducted a retrospective study was conducted in the Centre Hospitalier Universitaire Vaudois (CHUV) including all births between the 1st January 1997 and 31st December 2011 to analyze the cesarean section (CS) rate using the different groups of the Robson classification in a Swiss maternity hospital. The overall CS rate was 29 %, mainly related to group 5 (multiparous with previous CS) and group 2 (nulliparous women induced or who had CS before labor). The study also shows that induction of labor on maternal request in nulliparous at term (group 2a) increased significantly the risk of CS compared to induction of labor for medical reason (p<0.001). The Robson classification system appears as a simple tool for monitoring CS rates. The main strategies for reducing CS rates will be through better selection of women for VBAC (vaginal birth after caesarean) and limitation of induction of labor, especially in nulliparous women.