Classification of episiotomy practices | OASIS | Â | |||||
---|---|---|---|---|---|---|---|
Without episiotomy | With episiotomy | P a | OR IC 95% | P | |||
n/N | % | n/N | % | ||||
1 – Nulliparous women with a single cephalic pregnancy, at ≥37 weeks gestation, non- instrumental delivery | 206/17,395 | 1.2 | 37/4844 | 0.8 | 0.01 | 0.6 [0.4–0.9] | 0.01 |
2 – Nulliparous women with a single cephalic pregnancy, at ≥37 weeks gestation, instrumental delivery | 212/5307 | 4.0 | 59/3677 | 1.6 |  0.001 | 0.4 [0.3–0.5] | 0.001 |
 2a -forceps/ spatula delivery | 101/1642 | 6.2 | 46/2089 | 2.2 | 0.001 | 0.3 [0.2–0.5] | 0.001 |
 2b -vacuum delivery | 111/3665 | 3.0 | 13/1588 | 0.8 |  0.001 | 0.3 [0.1–0.5] | 0.001 |
3 - Multiparous women with a single cephalic pregnancy, at ≥37 weeks gestation, non-instrumental delivery | 110/39,347 | 0.3 | 12/2582 | 0.5 | 0.09 | 1.7 [0.9–3.0] | 0.09 |
4 – Multiparous women with a single cephalic pregnancy, at ≥37 weeks gestation, instrumental delivery | 51/1960 | 2.6 | 9/717 | 1.3 | 0.04 | 0.5 [0.2–0.9] | 0.04 |
 4a - forceps/ spatula delivery | 18/455 | 4.0 | 6/390 | 1.5 | 0.04 | 0.4 [0.1–0.9] | 0.04 |
 4b - vacuum delivery | 33/1505 | 2.2 | 3/327 | 0.9 | 0.18 | 0.4 [0.1–1.3] | 0.14 |
5 – All women with a single cephalic pregnancy, at < 37 weeks gestation | 10/3000 | 0.3 | 2/374 | 0.5 | 0.63 | 1.6 [0.3–7.4] | 0.54 |
6 – All women with a single breech pregnancy | 4/1043 | 0.4 | 1/225 | 0.4 | 1 | 1.2 [0.1–10.4] | 0.89 |
7 – All women with multiple pregnancy | 2/676 | 0.3 | 2/143 | 1.4 | 0.14 | 4.8 [0.7–34.2] | 0.11 |
Total | 595/68,728 | 0.9 | 122/12,562 | 1.0 | 0.25 | 1.1 [0.9–1.4] | 0.24 |