| Delivery route | Exposed | Unexposed | ||
| Number | Perrcentage | Number | Percentage | |
| vaginal delivery | 50 | 71.4 | 117 | 83.6 |
| Caesarean section before labour | 15 | 21.4 | 11 | 7.9 |
| Caesarean section during labour | 5 | 7.1 | 12 | 8.6 |
| Total | 70 | 100.0 | 140 | 100.0 |