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Prevalence of clinically diagnosed mental ill-health in adults with intellectual disabilities is around 40%

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Q What is the prevalence of mental ill-health in adults with intellectual disabilities?


Embedded ImageDesign:

Cross-sectional study.

Embedded ImageSetting:

Greater Glasgow Health Board area, Scotland; 2002–4.

Embedded ImagePopulation:

1023 adults (⩾16 years old) with intellectual disabilities, identified through social work services, local authorities, local specialist health services, the Health Board, the Scottish Executive Statistical Department, and primary healthcare services. Adults with IQ scores between 70 and 80 with complex health needs were excluded.

Embedded ImageAssessment:

Initial assessment included: review of case notes; the Psychiatric Assessment Schedule for Adults with Developmental Disabilities (PAS-ADD); C21st Health Check (assessment of developmental level, physical and mental health, problem behaviours and autistic-spectrum disorders); physical health assessments and blood tests. Participants were referred for full psychiatric assessment if a mental health problem …

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  • For correspondence: Professor Sally-Ann Cooper, Academic Centre, Gartnavel Royal Hospital, 1055 Great Western Road, Glasgow, G12 0XH, UK; SACooper{at}

  • Sources of funding: the Greater Glasgow Health Board and the West of Scotland Research and Development Mental Health Programme.


  • Competing interests: None.