| Family history | Nonremarkable, N = 3 (33.3%) Hypothyroidism, N = 2 (22.2%) Developmental delay, N = 2 (22.2%) Epilepsy, N = 1 (11.1%) Attention deficit hyperactivity disorder, N = 1 (11.1%) |
| Gestation and delivery period (abnormalities) | Preterm delivery, N = 9 (100%) Cesarean section, N = 9 (100%) Low birth weight, N = 9 (100%) |
| Psychomotor development | Retarded, N = 9 (100%) Mild intellectual disability, N = 4 (44.4%) Moderate intellectual disability, N = 3 (33.3%) Severe intellectual disability, N = 2 (22.2%) |
| Neurological examination | Spastic diplegia, N = 3 (33.3%) Right hemiparesis, N = 2 (22.2%) Left hemiparesis, N = 2 (22.2%) Spastic tetraplegia, N = 2 (22.2%) |
| Electroencephalography | Generalized paroxysmal changes, N = 9 (100%) |
| Seizures’ morphology | Myoclonic seizures (MS), N = 9 (100%) Tonic-clonic seizures (GTCS), N = 9 (100%) |
| Antiepileptic treatment | Valproic acid (VPA), N = 9 (100%) Levetiracetam (LEV), N = 9 (100%) |
| Brain MRI | Periventricular leukomalacia (PVL), N = 9 (100%) |
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