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International Journal of Alzheimer’s Disease
Volume 2012 (2012), Article ID 829743, 4 pages
Clinical Study

Lack of Correlation of WAIS Digit Span with Clox 1 and the Dementia Rating Scale in MCI

1Department of Psychology, Knox College Galesburg, IL 61401, USA
2Department of Nursing, UMass Lowell, Lowell, MA 01854, USA
3Department of Biological Sciences, UMass Lowell, Lowell, MA 01854, USA
4Center for Cellular Neurobiology and Neurodegeneration Research, UMass Lowell, Lowell, MA 01854, USA

Received 25 October 2011; Accepted 20 January 2012

Academic Editor: Patrizia Mecocci

Copyright © 2012 Jevin Jay Lortie et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Individuals with MCI declined in performance over 6 months in the Clock-drawing (Clox 1) and the WAIS Digit Span tests, but not in the Dementia Rating Scale (DRS). Individual performance on Clox 1 and Digit Span did not correlate after 6 months. Performance on the Digit Span Test also did not correlate with the DRS, but performance on Clox 1 correlated with the DRS. Performance in Clox 1 was, therefore, not a predictor of performance in the Digit Span Test. These findings support the use of a test battery containing the Digit Span test to detect and track cognitive decline in MCI.