title: Dementia and cognitive impairment in the oldest old: a comparison of two rating methods.
abstract: Rates of cognitive impairment in a representative population of the oldest old (aged 84 to 90) were examined using two indicators: The Global Deterioration Scale (GDS), and a Cognitive Rating (CR) derived from performance on five neuropsychological tests. Prevalence was estimated at 25.3%, using the GDS, and 30% with the CR. The overall degree of congruence between the measures was high, with most disagreements involving mildly impaired cases. The results indicate a high degree of convergence of clinical and neuropsychological indicators. The findings also confirm high rates of impairment among the oldest old.
authors.affiliation: Institute for Gerontology, Jönköping, Sweden.
authors.forename: B
authors.initials: B
authors.lastname: Johansson
authors.forename: S H
authors.initials: SH
authors.lastname: Zarit
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D003072:Cognition Disorders / Q000175:diagnosis / Q000453:epidemiology* / Q000523:psychology; D015331:Cohort Studies; D003430:Cross-Sectional Studies; D003704:Dementia / Q000175:diagnosis / Q000453:epidemiology* / Q000523:psychology; D005260:Female; D006801:Humans; D015994:Incidence; D007326:Institutionalization; D008137:Longitudinal Studies; D008297:Male; D008609:Mental Status Schedule / Q000706:statistics & numerical data; D009483:Neuropsychological Tests / Q000706:statistics & numerical data*; D011594:Psychometrics; D013548:Sweden / Q000453:epidemiology