Psychiatric symptoms and problem behaviours in people with intellectual disabilities

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Abstract
Background  Previous studies have suggested different patterns of associations between psychiatric symptoms and problem behaviours in people with intellectual disabilities (ID). The aim of this study was to investigate which problem behaviours are associated with specific psychiatric symptoms and the relative strength of these specific associations.Method  A cross sectional survey using the Psychiatric Assessment Schedule for Adults with Developmental Disabilities Checklist and the Disability Assessment Schedule was carried out in a sample of 214 adults with ID.Results  Self‐injurious and, to a lesser extent, aggressive problem behaviours were most associated with affective type symptoms. Screaming and destructive behaviours tended to be more associated with autism‐related social impairment rather than conventional psychiatric symptoms.Conclusions  This study gives further evidence of associations between psychiatric symptoms and specific problem behaviours in people with ID. It may be particularly useful to consider the diagnosis of affective disorders if a person with ID shows self‐injurious or aggressive behaviours.