Table 2: Clinical characteristics of patients.

Clinical characteristics 𝑁 (%)MeanRange
36 patients

Age at surgery, years278–71
Age at onset7.41–19
Duration19.52–52
Female14 (38%)
Location:
 frontal28 (78%)
 parietal 6 (17%)
 occipital 2 (5%)
Presence of risk factor14 (38%)
Presence of GTC seizure14 (38%)
Pathology:
 gliosis25 (70%)
 MCD11 (30%)
Scalp EEG:
 Group 112 (33%)
 Group 2 8 (22%)
 Group 3 9 (25%)
 Group 4 7 (15%)
Ictal scalp EEG patterns:
 focal Ictal Beta6/30 (20%)
 other24/30 (80%)
iEEG onset patterns
 Fast frequency (>14 Hz)17/31 (55%)
 Other14/31 (45%)
Localized SPECT13 (36%)
Localized SISCOM22 (61%)

GTC: generalized tonic clonic seizure.
MCD: malformation of cortical development.
IED: interictal epileptiform discharge.
Group 1: localized IED; Group 2: lateralized but not localized IED; Group 3: generalized or bilateral IED; Group 4: no IED.