| Risk factors | Number of patients (n) | Percentage (%) | |
| Prenatal | |||
| - Threat of miscarriage or vaginal bleeding | 27 | 20.8 | |
| - Maternal disease | 12 | 9.2 | |
| - Multiple gestation | 9 | 6.9 | |
| Perinatal | |||
| - Asphyxia | 68 | 52.3 | |
| - Low birth weight | 54 | 41.5 | |
| - Prematurity | 46 | 35.4 | |
| - Difficult delivery | 44 | 33.8 | |
| Postnatal | |||
| - Neonatal convulsion | 24 | 18.5 | |
| - Neonatal hyperbilirubinemia | 19 | 14.6 | |
| - Neonatal infection | 13 | 10 | |
| - Intracraniyal hemorrhage | 5 | 3.8 | |
| Undetermined | 13 | 10 | |