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Table 3 OASIS according to classification of episiotomy practices, vaginal deliveries, 2011–2016

From: A novel classification for evaluating episiotomy practices: application to the Burgundy perinatal network

Classification of episiotomy practices Number of OASIS / Number of women OASIS rate of each group (%) Relative size of each group (%)a Contribution of each group to OASIS rate (%) b
1 – Nulliparous women with a single cephalic pregnancy, at ≥37 weeks gestation, non-instrumental delivery 243/ 22,239 1.1 27.4 33.9
2 – Nulliparous women with a single cephalic pregnancy at ≥37 weeks gestation, instrumental delivery 271/ 8984 3.0 11.1 37.8
3 – Multiparous women with a single cephalic pregnancy at ≥37 weeks gestation, non- instrumental delivery 122/ 41,929 0.3 51.6 17.0
4 – Multiparous women with a single cephalic pregnancy at ≥37 weeks gestation, instrumental delivery 60/ 2677 2.2 3.3 8.4
5 – All women with a single cephalic pregnancy at < 37 weeks gestation 12/ 3374 0.4 4.2 1.7
6 – All women with a single breech pregnancy 5/ 1268 0.4 1.6 0.7
7 – All women with multiple pregnancy 4/ 819 0.5 1.0 0.6
Total 717/ 81,290 0.9 100 100
  1. OASIS obstetric anal sphincter injuries
  2. anumber of women in the group / total number of women delivered
  3. bnumber of OASIS in the group / total number of women having OASIS