Table 1.

Sample characteristics

	Right-handed (n = 126) Mean (SE)	Non-right-handed (n = 36) Mean (SE)	p
Demographics
Age (years)	38.3 (1.05)	39.5 (1.72)	.59
Gender (% male/female)	48/52	42/58	.47
Education (years)	13.2 (0.22)	14.3 (0.49)	.02
Full-scale IQ*	93.5 (1.13)	91.3 (2.41)	.38
EHI score	89.6 (1.19)	−50.5 (8.06)	<.001
Familial sinistrality (% with/without)	44/56	56/44	.20
(n with/without)	54/70	20/16	--
fMRI task performance
Tone decision task (% correct)	91.9 (0.92)	89.8 (2.03)	.32
Semantic decision task (% correct)	81.2 (0.84)	80.9 (1.48)	.83
Seizure characteristics
Side of seizure focus (% right/left)	44/56	44/56	.93
(n right/left)	55/71	16/20	--
Age at onset of intractable seizures (years)	17.7 (1.14)	15.8 (1.82)	.41
(% early/intermediate/late)	34/32/34	34/40/26	.62
(n early/intermediate/late)	42/41/42	12/14/9	--
Hippocampal sclerosis (% right/left/bilateral/none)**	20/19/3/56	14/33/0/50	.35
(n right/left/bilateral/none)	25/24/4/70	5/12/0/18	--
Later had epilepsy surgery (%)	85	81	.53
(n)	107	29	--

Note. EHI = Edinburgh Handedness Inventory;

^*Based on Wechsler Adult Intelligence Scale – III or IV;

^**Hippocampal sclerosis data were missing for three right-handed patients and one left-handed patient.