The prevalence of epilepsy was estimated by defining an initial prevalence ratio based on a population study and modifying this figure on the basis of various factors which influenced it. The definition required 3 seizures diagnosed by a doctor and the influencing factors included false-negative responses (where the diagnosis was confirmed), false reporting (where the diagnosis had not been established) and falsely low seizure counts (where therapy had reduced the number of seizure below the mandatory 3). As a result of these calculations the figure of approximately 1 in 50 was offered as a reliable and reasonable estimate of the true prevalence ratio of epilepsy within a well-defined Australian population.
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