| Variables | Number of cases | Percentage (%) |
| Birth weight (g) | ||
| <2500 | 5 | 2.1 |
| 2500 - 4000 | 148 | 56.7 |
| >4000 | 110 | 41.2 |
| Age at diagnosis (days) | ||
| 0 - 10 | 137 | 51.9 |
| 10 - 20 | 60 | 22.5 |
| 20 - 28 | 66 | 25.6 |
| Total | 263 | 100.0 |