Table 2.
Neonatal outcomes in occiput posterior and anterior births and the risk difference between the groups
| Outcome | ALL N = 27,648 | Occiput posterior N = 1292 | Occiput anterior N = 26,356 | Risk difference | ||
|---|---|---|---|---|---|---|
| n (%) | n (%) | 95% CI | n (%) | 95% CI | 95% CI | |
| Umbilical artery pH | ||||||
| < 7.00 | 88 (0.4) | 5 (0.5) | 0.21–1.14 | 83 (0.4) | 0.34–0.53 | 0.06 (−0.26–0.78) |
| < 7.05 | 278 (1.4) | 16 (1.6) | 0.96–2.53 | 262 (1.3) | 1.19–1.52 | 0.22 (−0.44–1.25) |
| < 7.10 | 789 (3.9) | 56 (5.5) | 4.24–7.04 | 733 (3.8) | 3.51–4.05 | 1.71 (0.40–3.35) |
| Metabolic acidaemiaa | 35 (0.2) | 2 (0.2) | 0.05–0.72 | 33 (0.2) | 0.12–0.24 | 0.03 (−0.15–0.62) |
| Apgar < 7 at 5 min | 208 (0.8) | 20 (1.5) | 1.00–2.38 | 188 (0.7) | 0.62–0.83 | 0.83 (0.25–1.71) |
| Neonatal care | 458 (1.7) | 38 (2.9) | 2.15–4.01 | 420 (1.6) | 1.45–1.75 | 1.35 (0.51–2.47) |
| Composite morbidityb | 567 (2.1) | 47 (3.6) | 2.75–4.80 | 520 (2.0) | 1.81–2.15 | 1.66 (0.72–2.89) |
Data are presented as n (%) with 95% confidence interval (CI). Calculations were only made on deliveries with complete registration of data
aMetabolic acidaemia: umbilical artery pH < 7.00 and base deficit ≥ 12 mmol/L
bComposite morbidity: any of Apgar score < 7 at 5 min; pH < 7.00; metabolic acidaemia or admission to neonatal care