| Total number†| Mediolateral episiotomy | No Mediolateral episiotomy | RR (95% CI) | |||
---|---|---|---|---|---|---|---|
 | n | pH umbilical artery < 7.10 or 5-min Apgar score < 7, n (%) | n | pH umbilical artery < 7.10 or 5-min Apgar score < 7, n (%) | Univariate analysis * | Using IPTW * | |
Whole population | 3586 | 966 | 55 (5.7) | 2620 | 245 (9.4) | 0.73 (0.54–1.00) | 0.84 (0.70–1.01) |
Forceps/spatula delivery | 1141 | 702 | 20 (4.5) | 439 | 62 (8.8) | 0.56 (0.32–0.98) | 0.56 (0.39–0.81) |
Vacuum delivery | 2442 | 526 | 35 (6.6) | 1916 | 183 (9.6) | 0.84 (0.57–1.23) | 0.97 (0.79–1.20) |