Objective: This study compared patients with both mental retardation and a psychiatric diagnosis with patients who did not have co-occurring mental retardation who were served in Ontario's tertiary mental health care system in terms of demographic characteristics, symptom profile, strengths and resources, and clinical service needs.
Methods: A secondary analysis of data from the Colorado Client Assessment Record (CCAR) that were collected between 1999 and 2003 from all tertiary psychiatric hospitals in Ontario, Canada, was completed for a random sample of 3,927 cases, representing 12,470 patients receiving psychiatric services.
Results: Patients with both mental retardation and a psychiatric diagnosis differed from those who did not have mental retardation in terms of demographic characteristics, diagnostic and symptom profile, resources, and recommended level of care.