Table 2 Rates of complications among 46,088 women who had a spontaneous vaginal delivery in 2015–16
| Â | Number of women experiencing outcome (%) | Crude OR (95% CI) | Adjusteda OR (95% CI) | p value | ||
|---|---|---|---|---|---|---|
|  | among all women (n = 46,088) | among women recorded as not having waterbirth (n = 39,824) | among women recorded as having waterbirth (n = 6284) | |||
  Maternal | ||||||
 Obstetric anal sphincter injury | 1480 (3.21%) | 1259 (3.16%) | 221 (3.53%) | 1.12 (0.97, 1.30) | 1.00 (0.86,1.16) | 0.99 |
 Postpartum haemorrhage > = 1500 ml | 552 (1.20%) | 496 (1.25%) | 56 (0.89%) | 0.72 (0.54,0.94) | 0.68 (0.51,0.90) | 0.007 |
  Neonatal | ||||||
 Apgar< 7 at 5 min of age | 270 (0.59%) | 234 (0.59%) | 36 (0.57%) | 0.98 (0.69,1.39) | 0.95 (0.66,1.36) | 0.78 |
 Neonatal admissionb | 1287 (3.09%) | 1168 (3.25%) | 119 (2.11%) | 0.64 (0.53,0.78) | 0.65 (0.53,0.78) | < 0.001 |