Table 4. Perinatal outcomes of breech presentations in the study epochs before and after the introduction of universal POCUS at 36 weeks in in Norfolk Norwich University Hospital.
| Outcomes | Before universal POCUS (n = 167) | After universal POCUS (n = 142) | RR (95% CrI), flat prior* | Posterior probability of adverse event reduction | RR (95% CrI), informative prior† | Posterior probability of adverse event reduction |
|---|---|---|---|---|---|---|
| Term breech presentations that were undiagnosed, n (%) | 27 (16.2) | 5 (3.5) | 0.20 (0.07, 0.51) | 99.9% | 0.31 (0.21, 0.45) | >99.9% |
| NNU admission, n (%) | 5 (3.0) | 3 (2.1) | 0.53 (0.11, 2.40) | 78.4% | 0.84 (0.54, 1.34) | 77.0% |
| HIE, n (%) | 0 (0.0) | 0 (0.0) | NE | – | NE | – |
| Apgar <7 at 5 minutes, n (%) | 3 (1.8) | 2 (1.4) | 0.72 (0.10, 4.30) | 63.0% | 0.60 (0.39, 0.88) | 99.5% |
| Extended perinatal mortality, n (%) | 0 (0.0) | 0 (0.0) | NE | – | NE | – |
*Weakly informative priors (N~μ, σ) for population mean and (Student t, df = 3) model intercept.
†Informative priors (N~μ, σ) for population mean was derived from Salim and colleagues and a weakly informative prior (Student t, df = 3) for model intercept.
CrI, credible interval; HIE, hypoxic ischemic encephalopathy; NE, not estimable; NNU, neonatal unit; POCUS, point-of-care ultrasound; RR, relative risk.