Table 2:

Neurophysiological characteristics

Neurophysiological characteristics	All subjects	Functional Levels
		I	2	3	4
EEG findings (n, %)	N=79	n=26	n=32	n=13	n=8
No abnormality	25 (32)	7 (9)	13 (16)	4 (5)	1 (1)
Non-epileptiform abnormality only	24 (30)	9 (11)	10 (13)	3 (4)	2 (3)
Epileptiform abnormality only	6 (8)	2 (3)	4 (5)	0 (0)	0 (0)
Both	24 (30)	8 (10)	5 (6)	6 (8)	5 (6)
Type of non-epileptiform abnormality (n, %)
Diffuse slowing only	14 (27)	4 (8)	4 (8)	4 (8)	2 (4)
Focal slowing only	34 (67)	14 (27)	13 (25)	3 (6)	4 (8)
Both	3 (6)	0 (0)	0 (0)	2 (4)	1 (2)
Type of epileptiform abnormality (n, %)
Interictal epileptiform discharges only	26 (81)	8 (25)	7 (22)	6 (19)	5 (15)
Electrographic seizures	6 (19)	1 (3)	4 (13)	0 (0)	1 (3)
Distribution of interictal epileptiform discharges
Unifocal	21 (70)	8 (27)	7 (23)	5 (17)	1 (3)
Multifocal/Generalized	9 (30)	2 (7)	2 (7)	1 (3)	4 (13)
Location of interictal epileptiform discharges
Right temporal	3 (12)	3 (12)	0 (0)	0 (0)	0 (0)
Left temporal	6(24)	1 (4)	2 (8)	2 (8)	1 (4)
Right frontal	3 (12)	1 (4)	1 (4)	1 (4)	0 (0)
Left frontal	3 (12)	0 (0)	2 (8)	1 (4)	0 (0)
Right parieto-occipital	1 (4)	1 (4)	0 (0)	0 (0)	0 (0)
Bitemporal	2 (8)	0 (0)	1 (4)	0 (0)	1 (4)
Multifocal	4 (16)	0 (0)	0 (0)	1 (4)	3 (12)
Generalized	3 (12)	2 (8)	1 (4)	0 (0)	0 (0)
Index of interictal epileptiform discharges
<1%	12 (48)	6	1	2	3
1-10%	7(28)	1	3	3	0
10-50%	5 (20)	1	2	0	2
>50%		0	1	0	0

Note. There were no significant differences in neurophysiological patterns across functional groups using Fisher’s Exact Test.