Table 3 Prediction of the duration of vaginal delivery (minutes) in the two study groups
|  | Trans-labial ultrasound plus vaginal examination group (n = 196) | Vaginal examination only group (n = 196) |
|---|---|---|
Mean ± SD | 144.88 ± 99.25 | 432.99 ± 267.71 |
Range | 15–480 | 25–1020 |
P-value (Mann-Whitney U test) | < 0.001 | |