Context To our knowledge, there is no published information on the epidemiology of autism
spectrum disorders (ASDs) in adults. If the prevalence of autism is increasing, rates in older
adults would be expected to be lower than rates among younger adults. Objective To
estimate the prevalence and characteristics of adults with ASD living in the community in
England. Design A stratified, multiphase random sample was used in the third national
survey of psychiatric morbidity in adults in England in 2007. Survey data were weighted to�…