.528, CI: 1,472-1,587) and 2012 (OR = 1.459, CI: 1,383-1,540), and a lower rate of severe perineal trauma in 2007 (OR = 0.164, CI: 0.095-0.283), 2010 (OR = 0.16, CI: 0.110-0.232) and 2012 (OR = 0.19, CI: 0.107-0.336). Regarding severe perineal injury, when independent variables were adjusted, maternal age ceased to have a significant correlation in 2012 (OR = 0.994, CI: 0.970-1.018).