| Etiologies | Spasm | Seizure | Developmental delay | Favorable outcome |
| HIE |
| *R | * |
|
| Meningitis & infarct | * | *R | * |
|
| Mitochondrial | * | * | * |
|
| HIE | * |
| * |
|
| Lissencephaly | * |
| * |
|
| Septooptic dys. | * |
| * |
|
| Lissencephaly, Milker-Dieker syn. |
| * | * |
|
| Trisomy 21 | *R | * | * |
|
| Tuberous sclerosis |
|
| †* | * |
| Lissencephaly |
| * | * |
|
| Frontal heterotopia |
| * | * |
|
| Leigh disease | * | * | N |
|
| Con. hypothyroidism |
| * | * |
|
| Trisomy 21 | *R |
| *Reg |
|
| Tuberous sclerosis |
| * | * |
|
| Tuberous sclerosis |
| *R | * |
|
| Mitochondrial |
| *R | * |
|
| Trisomy 15 |
|
| *Reg |
|