And, neither the DC-LD nor the DM-ID (or other diagnostic systems such as the DSM-IV and ICD-10) offer guidelines for determining this symptomatic threshold, above which an individual with intellectual disability would be thought to also have co-morbid ADHD.
(21) examined 1,023 adults with intellectual disability, with the purpose of identifying co-morbid psychiatric illness using the ICD-10, DSM-IV, and DC-LD. Following identification by a nurse clinician, each individual underwent a comprehensive psychiatric assessment by a psychiatrist, which included both an interview as well as a battery of rating scales.
The two newer systems described above (DC-LD and DM-ID) do not include this prohibition regarding PDD-ADHD co-morbidity.
It is not found in the diagnostic criteria for ADHD offered in the DC-LD or DM-ID.