One such poster involved a Gent University study by Herbert Roeyers and Martine Thys titled Underdiagnosis of Autism Spectrum Disorders in Individuals with Intellectual Disabilities. The authors point out that only a limited number of studies have examined the prevalence of ASD in ID populations; of intellectually disabled persons with autism spectrum disorders. The authors felt it is important to study this co-occurrence relationship between ASD and ID in order to improve quality of life for persons with this co-morbidity relationship. In their study the authors arrived at a prevalence rate of 12.5% of persons with ASD in the ID population studied or approximately 10 times the percentage for persons with ASD in the general population. Of the numbers identified with ASD only 38% were previously identified as having ASD indicating very serious underdiagnosis of ASD in the Intellectually Disabled population.
While the New York Times expresses great concern over possible future DSM5 exclusion of high functioning autistics, and prompts much reaction from autism experts, neither the NYT, nor most of the experts, even mention current underdiagnosis of autism in people with intellectual disability.