Table 1.
Subject characteristics
| Overall | |
|---|---|
| (N = 150) | |
| Age (years) | |
| Mean (SD) | 37.1 (11.5) |
| Sex | |
| Male | 78 (52.0%) |
| Female | 72 (48.0%) |
| Years of Education | |
| Mean (SD) | 13.7 (2.23) |
| Handedness | |
| Ambidextrous | 6 (4.0%) |
| Left | 17 (11.3%) |
| Right | 127 (84.7%) |
| Age of Seizure Onset | |
| Mean (SD) | 17.0 (13.2) |
| History of Prior Resection | |
| Yes | 30 (20.0%) |
| No | 120 (80.0%) |
| History of TBI | |
| Yes | 9 (6.0%) |
| No | 141 (94.0%) |
| Number of Implanted Channels | |
| Mean (SD) | 123 (40.4) |
| Seizure Onset Zone (SOZ) | |
| Multifocal SOZa | 77 (51.3%) |
| Focal SOZ | 73 (48.7%) |
| Normalized IED Rate (IEDs/hour)b | |
| SOZ (Mean (SD)) | 6.53 (17.47) |
| NON-SOZ (Mean (SD)) | 0.34 (0.50) |
| Combined (Mean (SD)) | 0.60 (0.72) |
a
Multifocal seizure onset zones (SOZs) were most commonly in neighboring brain regions (e.g. lateral temporal and mesial temporal regions).
b
Normalized IED Rates were calculated per session per contact by dividing initial IED rates by the total number of contacts in each region; thus, these normalized rates represent the average number of IEDs detected by each individual contact per hour. SOZ refers to average IED rates of contacts in the SOZ. NON-SOZ refers to average IED rates of contacts outside of the SOZ. Combined refers to global IED rates averaged across all contacts.