Examination of the prevalence of epilepsy and health service utilization in 1,595 people with intellectual disabilities in Wales found 16.1% had epilepsy. Standardized activity ratios were 3.07, 2.03, and 3.09 for inpatients, outpatients, and accident and emergency, respectively. Patients with intellectual disability and co-existing epilepsy used secondary care services more frequently than did those with intellectual disability only. (Contains references.) (Author/DB)