Table 1.

General Characteristics of the Study Population

Gender	60% female
Mean duration of follow-up	5.4 years
Mean age of onset of absence	6.5 years
Mean age of onset of generalized tonic-clonic seizures	11.4 years
Generalized tonic-clonic seizures	17%
Myoclonic jerks	2%
Febrile seizures	11%
EEG
Polyspike–wave pattern	26%
Focal abnormalities	16%
Abnormal background	3%
Antiepileptic drug history
1st antiepileptic drug ethosuximide	70%
1st antiepileptic drug valproate acid	17%
Only one antiepileptic drug	61%
>1 antiepileptic drug	39%
Positive family history of any seizure	34%
Of generalized tonic-clonic seizures	24%
Of absence	5%
Of febrile seizures	5%

NOTE: EEG, electroencephalogram.