Table I.

Demographics and clinical variables by IQ group

Demographics	Low IQ (56–84)		Middle IQ (85–100)		High IQ (101–130)		pb
(n=48)	(n=58)		(n=58)
	Mean	SD	Mean	SD	Mean	SD
Age at baseline, y	12.02	1.56	11.58	1.82	11.81	1.92	0.4439
Age at onset of seizures, y	5.89	3.55	5.89	3.89	7.71	3.61	0.0128
Duration of seizures, y	6.16	3.68	5.69	4.05	4.09	3.44	0.0124
Seizure severitya	14.85	5.41	13.04	5.44	10.35	5.61	0.0002
Mothers’ education, y	12.90	2.76	13.71	2.20	13.69	3.08	0.2266
Mothers’ age, y	38.60	5.25	36.81	8.64	38.59	9.34	0.4033
Clinical variables	n	%	n	%	n	%
Male child	25	52	24	41	34	59	0.1731
Caucasian child	43	90	53	91	54	93	0.8368
Seizure type
Absence	5	11	8	14	10	18	0.3240
Simple partial	2	4	1	2	3	5
Complex partial	17	36	11	20	18	32
Partial with generalization	7	15	14	25	7	12
Generalized tonic–clonic	5	11	7	13	10	18
Multiple types	9	19	15	27	9	16
Unclassified	2	4	0	0	0	0
Medications
None	2	4	1	2	3	5	0.7051
One	36	75	49	84	46	79
Polytherapy	10	21	8	14	9	16

p value reported is for ANOVA F-test for equality of means for continuous variables, and χ² test or Fisher’s exact test of association for categorical variables.

^aPotential range of seizure severity scale is 0 to 36; actual range in our study was 0 to 27.