. Author manuscript; available in PMC: 2008 Feb 18.

Published in final edited form as: J Clin Exp Neuropsychol. 2007 Jan;29(1):13–24. doi: 10.1080/13803390500263568

Table 2.

Epilepsy and surgery characteristics as a function of age of onset classification

Group	Follow-up time^(mths)Mean (SD)*	Age at onset¹ (yrs)Mean (SD)	Age at surgery^ (yrs) Mean (SD)*	Lobectomy hemisphere² (L:R)
Early onset (n = 34)	19.3 (22.2)	3.6 (2.9)	32.9 (10.7)	18:16
Late onset (n = 32)	23.4 (27.1)	18.1 (8.0)	35.6 (11.0)	19:13

	Pre surgery # seizuresy^ (per day)*	Post surgery # seizures^ (per day)*	Pre surgery # meds^ mean (SD)*	Post surgery # meds^ mean (SD)*

Early onset (n = 34)	.92 (1.8)	.04 (.18)	1.9 (.55)	1.5 (.51)
Late onset (n = 32)	1.3 (2.3)	.14 (.55)	2.0 (.74)	1.5 (.68)

Independent samples t-test revealed no differences between groups;

t(64) = −10.0, p < .0001;

Chi-square test revealed no differences between groups.