A sample of 1070 elderly persons aged over 65 living in the Liverpool community was interviewed using the community version of the Geriatric Mental State (GMS) and the findings processed to provide a computerised diagnosis by AGECAT. Levels of organic disorder, probably dementia, reached 5.2%, intermediate between those of London and New York derived from previous studies. Levels for depressive illness overall were below those of other studies at 11.3% while levels for neurotic disorder were much the same at 2.4%. The rise in the prevalence of dementia with age was further confirmed. The GMS AGECAT Package provides a method for standardising both the collection of data and the diagnostic process for comparative epidemiological studies and other research.
The Geriatric Mental State Examination (GMS), a standardised psychiatric interview, and its computerised diagnostic system, AGECAT, have been applied to a large (1070) sample of subjects aged over 65 in Liverpool. In a split-half study of this sample, diagnostic scales within the GMS and a diagnostic index derived from them were tested for efficacy in cases of organic and early organic illness (mostly various stages of dementia) and depressive illness. Results demonstrated high levels of sensitivity and specificity, and positive predictive values were within the expected range when applied to these disorders, given their low prevalence in the community. The GMS, when used in this way, is a flexible and effective case-finding instrument.
A random community sample of 1070 subjects aged over 65 was interviewed by trained non-medical interviewers using the Geriatric Mental State, community version (GMSA). A sub-sample of 126 subjects was selected so as to contain possible early cases of dementia, pseudo-dementia, and normal subjects; and re-interviewed, a mean I year and 23 weeks later, by a group of psychiatrists in training. The computer diagnosis AGECAT. based on GMSA applied by non-medical raters, had predicted at initial interview, nine out of twelve cases of dementia at follow-up and five out of nine borderline cases. An OrganiciDepression Index may prove useful in predicting which of those cases with early organic levels will eventually develop dementia, depression or recover.
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