| Parity | Cases | Percentage | Controls | Percentage |
| 1 | 44 | 16.2 | 155 | 28.5 |
| 2 - 4 | 69 | 25.4 | 299 | 55 |
| 5 and above | 159 | 58.4 | 90 | 16.5 |
| Total | 272 | 100.0 | 544 | 100.0 |