Table 2.
Performance of Maternal-Fetal Medicine Units Network (MFMU) vaginal birth after cesarean (VBAC) prediction model (1) in women with two prior cesarean deliveries
| MFMU VBAC Model Predicted Probability of VBAC Success |
Number of Women in Each Decile of Predicted VBAC Success |
Actual VBAC Success Ratea |
|---|---|---|
| .10-<.20 | 1 | 0 |
| .20-<.30 | 11 | 9.1 (11.2, 29.3) |
| .30-<.40 | 22 | 36.4 (14.5, 58.2) |
| .40-<.50 | 30 | 46.7 (27.7, 65.6) |
| .50-<.60 | 53 | 47.2 (33.3, 61.1) |
| .60-<.70 | 53 | 64.2 (50.8, 77.5) |
| .70-<.80 | 58 | 70.7 (58.6, 82.8) |
| .80-<.90 | 82 | 82.9 (74.6, 91.2) |
| .90-<1 | 59 | 88.1 (79.6, 96.6) |
VBAC = vaginal birth after cesarean
a
The mean rate of actual VBAC success within each decile of predicted probability with 95% confidence intervals