Delivery outcomes
The estimated risks (adjusted OR) among all teenagers (13–19 years of age) compared with the reference women were: caesarean section 0.6 (0.6 to 0.7), operative vaginal delivery 0.6 (0.6 to 0.7) anal sphincter rupture 0.4 (0.3 to 0.5) and breech presentation 0.7 (0.6 to 0.8) (figure 1). However, when analysed in subgroups according to age, the estimated risks among 13-year-olds to 15-year-olds did not differ significantly from those in the reference group, except for caesarean section.
The percentages of planned caesarean sections were similar among 13-year-olds to 15-year-olds and the reference women (4.8% (n=4) vs 4.5% (n=2301)), but signifi- cantly lower among 16–17 and 18-year-olds to 19-year-olds (2.4% (n=30) and 3.2% (n=192), respectively). Regarding urgent Caesarean sections, the frequencies were lower among all teenagers (7.2% (n=524) vs 11.7% (n=5996)) and descended according to age. In the case of emergency caesarean sections, however, there were no significant differences (1.1% (n=83) vs 1.5% (n=766)).