Table 2: Presurgery predictors of age, seizures, and cognition on postsurgery seizure outcome.

VariablesEngels Class I
( )
Engels Class II–IV
( )
Statistics Z valueP Value
MeanSDMeanSD

Age at the time of surgery8.104.186.437.64−0.760.44
Age of seizure onset4.0783.840.070.03−2.150.03
Frequency of seizures/day113.33269.296.502.12−0.170.86
Total duration of seizures before surgery4.113.392.052.75−1.120.26
IQ/DQ (pre op)59.2017.9735.000.01−1.410.15