Table 1: Demographic and clinical data.

MTLEMTLE + DMTLE + PControlsStatistics

Male ( )9775 No difference
Female ( )81065

IPI present ( )978n.a. No difference
IPI absent ( )8105n.a.

Age of first seizure (years)4.2 ± 3.86.0 ± 6.46.5 ± 8.4n.a.No difference

Age when seizures became recurrent or age of onset (years)10.3 ± 6.412.8 ± 7.914.6 ± 10.0n.a.No difference

Seizure type: CPS ( )834n.a. No difference
Seizure type: SGS ( )9149n.a.

Seizure frequency (monthly)10.8 ± 10.015.2 ± 10.78.0 ± 5.4n.a.No difference

Right HS ( )886n.a. No difference
Left HS ( )875n.a.
Bilateral HS ( )122n.a.

Right handedness ( 151413n.a. No difference
Left handedness ( )120n.a.
Bilateral handedness ( )110n.a.

Memory in verbal tasks: average or above ( )572n.a. No difference
Memory in verbal tasks: below average ( )121011n.a.

Memory in nonverbal tasks: average or above ( )1183n.a. Fisher’s exact test,
(MTLE ×
MTLE + P)
Memory in nonverbal tasks: below average ( )6910n.a.

Full-scale IQ85.7 ± 11.985.8 ± 8.177.8 ± 8.2n.a.No difference

Years at school6.8 ± 3.26.8 ± 4.73.9 ± 2.5n.a.No difference

Age at surgery (or at death for controls, in years)37.1 ± 6.337.3 ± 5.238.8 ± 4.347.3 ± 19.1No difference

Duration of epilepsy (years)26.7 ± 7.624.5 ± 9.124.2 ± 11.4n.a.No difference

Collected side: right ( )9975 No difference
Collected side: left ( )8865

Values indicated as mean ± std. deviation when applicable. IPI: initial precipitant injury; CPS: complex partial seizure; SGS: secondarily generalized seizures; HS: hippocampal sclerosis; n.a.: not applicable.