| Parity | Expulsion | |||||
| Yes | No | Total | ||||
| Number | Frequency (%) | Number | Frequency (%) | Number | Frequency (%) | |
| Primiparous | 0 | 0 | 3 | 4 | 3 | 4 |
| Pauciparous | 0 | 0 | 20 | 27 | 20 | 20 |
| Multiparous | 2 | 3 | 12 | 17 | 14 | 20 |
| Large multiparous | 1 | 1 | 35 | 48 | 36 | 49 |
| Total | 3 | 4 | 70 | 96 | 73 | 100 |