Mean C-section and vaginal delivery rates per period
| Period A | Period B | Period C | ||||
| Vaginal delivery | C-section | Vaginal delivery | C-section | Vaginal delivery | C-section | |
| Mean | 23.57% | 76.43% | 27.88% | 72.12% | 30.06% | 69.94% |
| SD | 0.023 | 0.019 | 0.034 | |||
| Shapiro-Wilk | P=0.975 | P=0.428 | P=0.192 | |||
| T-test | P<0.001 | P=0.004 | ||||