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

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© 2018 Stephansson et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 1 — X axis is BMI (kg/m²); different Y axis scales. OASIS = obstetric anal sphincter injury (perineal tear grade III–IV). Acute (emergency) cesarean delivery = all unplanned cesarean sections. *798,338 minus 57,134 with missing BMI (excluding births to women with bariatric surgery history).