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Patient characteristics
| Gender | Male | 2,696 (53%) |
| Female | 2,402 (47%) | |
| Race | Caucasian | 4,230 (83%) |
| Hispanic | 309 (6%) | |
| Other/Unknown | 264 (5%) | |
| African-American | 247 (5%) | |
| Asian | 48 (1%) | |
| Dominant seizure type | Partial/focal | 3,267 (64%) |
| Generalized | 1,831 (36%) | |
| Localization | Temporal | 1,348 (26%) |
| Extra-temporal | 1,689 (33%) | |
| Not-localized/Generalized | 2,061 (40%) | |
| Age of onset | mean ± SEM | 7.8 ± 10.0 |
| Age at implant | mean ± SEM | 27.1 ± 15.6 |
| Time to implant | < 10 years | 1,625 (32%) |
| ≥ 10 years | 3,473 (68%) |
