Table 1.
Demographic and Clinical Characteristics of the Samples
| Total Sample | Siblings | |
|---|---|---|
| (N = 332) | (n=225) | |
| Mean (SD) | Mean (SD) | |
| Age | 9.6 (2.5) | 9.6 (2.4) |
| IQ (Estimated from K-BIT) | 100.9 (15.3) | 103.6 (13.2) |
| Percent | Percent | |
| Gender (% Female) | 51% | 51% |
| Handedness (% Left-Handed) | 11% | 11% |
| Race | ||
| White/Non-Hispanic | 84% | 86% |
| African-American | 14% | 12% |
| Hispanic | 1% | 1% |
| Other | 1% | 1% |
| Primary Seizure Type | ||
| Generalized Tonic-Clonic | 23% | |
| Atonic, Akinetic, Motor | 1% | |
| Complex Partial Seizures | 26% | |
| Simple Partial | 6% | |
| Partial with Secondary Generalization | 29% | |
| Absence | 13% | |
| Unknown/Unclassified | 2% | |
| Etiology of Seizures | ||
| Idiopathic | 45% | |
| Partial Cryptogenic | 39% | |
| Partial Symptomatic | 8% | |
| Generalized Cryptogenic/Symptomatic | 3% | |
| Unknown | 5% | |
| Neurological Exam | ||
| Normal | 94% | |
| Abnormal | 5% | |
| Not Done/Missing | 1% | |
| Number of anti-epileptic drugs | ||
| 0 | 48% | |
| 1 | 50% | |
| 2 | 2% | |
| Significant MRI abnormality | 14% | |
| EEG slowing | 11% | |
| EEG epileptiform discharges | 61% |