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. 2018 Sep 26;15(9):e1002656. doi: 10.1371/journal.pmed.1002656

Fig 4. Delivery outcomes in singleton live term births in Sweden between 2006 and 2013 stratified by parity.

Fig 4

OASIS = obstetric anal sphincter injury (perineal tear grade III–IV). Emergency cesarean delivery = all unplanned cesarean sections. aElective cesarean deliveries excluded. bCesarean deliveries excluded. *Conditioned on the matching factors maternal age, parity, pre-surgery BMI category (using early-pregnancy BMI in controls), early-pregnancy smoking status, educational level, height, country of birth, and delivery year.