Gestational Risk as a Determining Factor for Cesarean Section according to the Robson Classification Groups.

Objective:  To analyze and compare the frequency of cesarean sections and vaginal deliveries through the Robson Classification in pregnant women attended at a tertiary hospital in two different periods.

Methods:  Cross-sectional, retrospective study of birth records, comprising 4,010 women, conducted from January 2014 to December 2015 in the only public regional referral hospital for the care of high- risk pregnancies, located in Southern Brazil.

Results:  The overall cesarean section rate reached 57.