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Dementia and Cognitive Impairment in the Oldest Old: A Comparison of Two Rating Methods

Published online by Cambridge University Press:  07 January 2005

Boo Johansson
Institute for Gerontology, Jönköping, Sweden
Steven H. Zarit
Department of Human Development and Family Studies, The Pennsylvania State University, University Park, Pennsylvania, U.S.A.


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.

Research and Reviews
© 1991 Springer Publishing Company

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