Table 1.

Patient demographics

VariablePatients ≥ 50 yPatients < 50 yp Value
Values are n or mean ± SD (range). Table shows comparisons using multivariate analysis of variance to compare older and younger patients.
n (M/F)30 (15/15)340 (171/169)
Mean age at surgery, y54.2 ± 4.732.8 ± 7.7
Mean education, y12.67 ± 2.29 (11–18)12.9 ± 2.03 (11–18)Not significant
Seizure duration, y35.8 ± 17.8 (6–62)25.0 ± 10.5 (1–47)<0.001
Age at seizure onset, y23.7 ± 16.9 (0.01–60)11.9 ± 9.7 (0.01–44)<0.001
Side of surgery (R/L)19/11167/173Not significant
Age at first risk, y19.7 ± 18.2 (0.01–60)8.5 ± 9.2 (0.01–44)<0.001
Baseline full-scale IQ95.9 ± 13.5 (75–124)89.7 ± 13.0 (57–134)<0.0156
Baseline verbal IQ98 ± 15 (75–127)91 ± 13 (54–132)<0.0051
Baseline performance IQ95.0 ± 12.1 (76–112)90.7 ± 13.8 (52–142)<0.098