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Social Psychiatry and Psychiatric Epidemiology
Published in: Social Psychiatry and Psychiatric Epidemiology 7/2007

01-07-2007 | ORIGINAL PAPER

Psychosis and adults with intellectual disabilities

Prevalence, incidence, and related factors

Authors: Sally-Ann Cooper, Elita Smiley, Jillian Morrison, Linda Allan, Andrew Williamson, Janet Finlayson, Alison Jackson, Dipali Mantry

Published in: Social Psychiatry and Psychiatric Epidemiology | Issue 7/2007

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Abstract

Objective

To determine the point prevalence, incidence, and remission over a 2-year period of psychosis in adults with intellectual disabilities, and to investigate demographic and clinical factors hypothesised to be associated with psychosis.

Method

A population-based cohort of adults with intellectual disabilities (n = 1,023) was longitudinally studied. Comprehensive face-to-face mental health assessments to detect psychosis, plus review of family physician, psychiatric, and psychology case notes were undertaken at two time points, 2 years apart.

Results

Point prevalence is 2.6% (95% CI = 1.8–3.8%) to 4.4% (95% CI = 3.2–5.8%), dependant upon the diagnostic criteria employed. Two-year incidence is 1.4% (95% CI = 0.6–2.6), and for first episode is 0.5% (95% CI = 0.1–1.3). Compared with the general population, the standardised incidence ratio for first episode psychosis is 10.0 (95% CI = 2.1–29.3). Full remission after 2 years is 14.3%. Visual impairment, previous long-stay hospital residence, smoking, and not having epilepsy were independently associated with psychosis, whereas other factors relevant to the general population were not.

Conclusions

The study of psychosis in persons with intellectual disabilities benefits the population with intellectual disabilities, and advances the understanding of psychosis for the general population. Mental health professionals need adequate knowledge in order to address the high rates of psychosis in this population.
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Metadata
Title
Psychosis and adults with intellectual disabilities
Prevalence, incidence, and related factors
Authors
Sally-Ann Cooper
Elita Smiley
Jillian Morrison
Linda Allan
Andrew Williamson
Janet Finlayson
Alison Jackson
Dipali Mantry
Publication date
01-07-2007
Publisher
D. Steinkopff-Verlag
Published in
Social Psychiatry and Psychiatric Epidemiology / Issue 7/2007
Print ISSN: 0933-7954
Electronic ISSN: 1433-9285
DOI
https://doi.org/10.1007/s00127-007-0197-9

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