Prevalence of Intellectual Disability and Comorbid Mental Illness in an Australian Community Sample

Article

White, Paul, Chant, David, Edwards, Niki, Townsend Claire and Waghorn, G.. 2005. "Prevalence of Intellectual Disability and Comorbid Mental Illness in an Australian Community Sample." Australian and New Zealand Journal of Psychiatry. 39 (5), pp. 395-400. https://doi.org/10.1111/j.1440-1614.2005.01587.x
Article Title

Prevalence of Intellectual Disability and Comorbid Mental Illness in an Australian Community Sample

ERA Journal ID13069
Article CategoryArticle
AuthorsWhite, Paul (Author), Chant, David (Author), Edwards, Niki (Author), Townsend Claire (Author) and Waghorn, G. (Author)
Journal TitleAustralian and New Zealand Journal of Psychiatry
Journal Citation39 (5), pp. 395-400
Number of Pages6
Year2005
PublisherSAGE Publications Ltd
Place of PublicationUnited Kingdom
ISSN0004-8674
1440-1614
Digital Object Identifier (DOI)https://doi.org/10.1111/j.1440-1614.2005.01587.x
Web Address (URL)https://journals.sagepub.com/doi/10.1080/j.1440-1614.2005.01587.x
Abstract

Objective: The aim of this study was to bring to light the high prevalence of Australians affected by intellectual disability and comorbid serious mental illnesses. Results from a broad scale study are used to explore the reasons for this regularly overlooked phenomenon. Methods: This study was based on secondary analysis of data collected in the national 'Disability, Ageing and Carers Survey, 1998'. The analysed data consisted of an Australian wide sample of 42 664 individuals living at home or in cared accommodation. Classification of intellectual disability and comorbid psychosis, anxiety and depressive disorder was based on the International Statistical Classification of Diseases and Related Health Problems, 10th Revision (ICD-10). Results: The prevalence of intellectual disability in the sampled population was 1.25%. Of these people 1.3% had a psychotic disorder, 8% had a depressive disorder and 14% had an anxiety disorder that had been present for at least 6 months and was of such severity that it too was disabling. Conclusions: Findings indicate that people with intellectual disability are at high risk of developing comorbid serious mental illness. Dual diagnosis is however, often overlooked due to difficulties associated with establishing a diagnosis of a mental disorder in people with an intellectual disability, a problem which is heightened when the individual's capacity to participate in a clinical assessment is limited.

KeywordsIntellectual disability; Mental retardation; Prevalence; Psychiatry
ANZSRC Field of Research 2020420313. Mental health services
420318. People with disability
420210. Social epidemiology
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Institution of OriginUniversity of Southern Queensland
Byline AffiliationsNo affiliation
University of Queensland
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