| Intervention (n = 70) | Control (n = 79) | Total (n = 149) | ||||
| Subjects | % | Subjects | % | Subjects | % | |
| Primipara | 34 | 45.3 | 41 | 54.7 | 75 | 100.0 |
| Multipara | 36 | 48.6 | 38 | 51.4 | 74 | 100.0 |