Epidemiologic aspects of epilepsy.

Epidemiologic studies of epilepsy pose a number of methodologic challenges with regard to the definition, classification, and identification of cases. The use of different procedures to address these difficulties makes it imperative to exercise great caution in comparing the results of such studies. Epidemiologic investigations have been consistent in demonstrating that epilepsy is a major neurologic disease throughout the world. Analytic investigations which are beginning to identify risk factors must be continued in order to initiate broad and effective programs of prevention and control.