Background It has often been stated that the prevalence of psychiatric disorders in people with intellectual dis-abilities is greater than it is in the population as a whole. Method The epidemiological studies on psychiatric disor-ders in people with intellectual disabilities were reviewed. Results There is evidence that the prevalence of psychi-atric disorder is greater in children with intellectual dis-abilities, compared with children with normal IQs, that it is higher in both adults and children with severe intel-lectual disabilities compared with people with mild or no intellectual disability and that the rate of problematic behaviour is higher in both adults and children having intellectual disabilities, than in their non-disabled peers. Conclusions There is no sound evidence that the preval-ence of psychiatric disorders in adults with mild intel-lectual disability is greater than in the population as a whole.
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