Centre for Policy on Ageing
 

 
The effects of preclinical dementia on estimates of normal cognitive functioning in aging
Author(s)Martin Sliwinski, Richard B Lipton, Herman Buschke, Walter Stewart
Journal titleThe Journals of Gerontology Series B: Psychological Sciences and Social Sciences, vol 51B, no 4, July 1996
Pagespp P217-P225
KeywordsDementia ; Cognitive processes ; Mental ageing ; Estimation.
AnnotationIndividuals with preclinical dementia have begun to decline cognitively, but still perform within normal limits on cognitive testing. Using data from a longitudinal study of people with dementia, age adjusted norms were computed using baseline data for the Selective Reminding Test and the WAIS verbal and performance scores, both including and excluding preclinical cases. Results indicate that by failing to exclude preclinical dementia, conventional normative studies underestimate the mean, overestimate the variance, and overestimate the effect of age on cognitive measures. Methods are discussed for selecting robust samples which generally exclude preclinical dementia.
Accession NumberCPA-970704010 A
ClassmarkEA: DA: D6: 3YG

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