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Table 4 Comparison of OASIS with or without episiotomy according to classification, vaginal deliveries, 2011–2016

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

Classification of episiotomy practices

OASIS

 

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

  1. OASIS obstetric anal sphincter injuries. OR odds ratio
  2. aFisher’s exact tests