Abstract
The prevalence, and incidence, of mental ill-health in adults with intellectual disabilities and autism were compared with the whole population with intellectual disabilities, and with controls, matched individually for age, gender, ability-level, and Down syndrome. Although the adults with autism had a higher point prevalence of problem behaviours compared with the whole adult population with intellectual disabilities, compared with individually matched controls there was no difference in prevalence, or incidence of either problem behaviours or other mental ill-health. Adults with autism who had problem behaviours were less likely to recover over a two-year period than were their matched controls. Apparent differences in rates of mental ill-health are accounted for by factors other than autism, including Down syndrome and ability level.
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Notes
Mental ill-health is used to describe all forms of psychiatric disorders or problem behaviour, excluding autism. Problem behaviour is used as the preferred term to describe behavioural disorders or challenging behaviour. Operationalised criteria for problem behaviours are provided in the Diagnostic Criteria for Psychiatric Disorders for use with Adults with Learning Disabilities/Mental Retardation (Royal College of Psychiatrists 2001).
Psychopathology refers to any symptoms of emotional and behavioural disturbance elicited during the process of assessment. This information is then used to provide a diagnosis based on agreed criteria contained in a standardised classification system.
The term problem behaviours encompasses all those listed in DC-LD (Royal College of Psychiatrists 2001) including: verbally aggressive behaviour; physically aggressive behaviour; destructive behaviour; self-injurious behaviour; sexually inappropriate behaviour; oppositional behaviour; excessively demanding behaviour, wandering behaviour and other problem behaviour.
The Diagnostic Criteria for Psychiatric Disorders for use with Adults with Learning Disabilities / Mental Retardation was developed as a diagnostic classificatory system for use with adults with intellectual disabilities, in recognition of the limitations of ICD-10 and DSM-IV.
See footnote 3.
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Acknowledgments
The research at T1 was funded by Greater Glasgow Health Board and the West of Scotland R&D Mental Health Programme. At T2 the research was funded by the Chief Scientist Office, Scottish Executive Health Department (reference CZH/4/96). We wish to thank the participants and their carers for participating in this study. We are grateful to Patricia Peters and Afshan Fairley for secretarial support, Andrew Williamson for data handling, and the NHS Greater Glasgow primary care liaison team.
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Melville, C.A., Cooper, SA., Morrison, J. et al. The Prevalence and Incidence of Mental Ill-Health in Adults with Autism and Intellectual Disabilities. J Autism Dev Disord 38, 1676–1688 (2008). https://doi.org/10.1007/s10803-008-0549-7
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DOI: https://doi.org/10.1007/s10803-008-0549-7