| Non-pregnancy group | 23 | 22 | ||
| Percentage (%) | 36.1 | 4.3 | ||
| Including indirect pregnancy | Total | 36 | 23 | 0.030 |
| Pregnancy group | 13 | 2 | ||
| Non-pregnancy group | 23 | 21 | ||
| Percentage (%) | 36.1 | 8.7 |