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Reliable Individual Change Scores on the 3MS in Older Persons With Dementia: Results From the Canadian Study of Health and Aging

Published online by Cambridge University Press:  10 January 2005

José Andrés Correa ,
Anne Perrault  and
Christina Wolfson
José Andrés Correa
Affiliation:
Department of Mathematics and Statistics, McGill University, Montreal, Quebec Department of Mathematical Sciences, Florida Atlantic University, Montreal
Anne Perrault
Affiliation:
Centre for Clinical Epidemiology and Community Studies, Jewish General Hospital, Montreal.
Christina Wolfson
Affiliation:
Centre for Clinical Epidemiology and Community Studies, Jewish General Hospital, Montreal.
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Abstract

We examined the degree of interrater agreement on the Modified Mini-Mental State Examination (3MS), administered both in the home and at the clinical examination, to determine the boundaries of reliable individual changes for 257 community-dwelling older persons who received a diagnosis of dementia at CSHA-1. Individual score differences were approximately normally distributed (mean of differences 0.2; SD 8.0; 95% confidence interval -16 to 16). The intraclass correlation coefficient was 0.85. Except for the language of testing, there was no relationship between score differences and the determinants investigated (i.e., age, education, type and severity of dementia). This study provides evidence that, in a time frame compatible with no change in cognition, the discrepancy between repeat 3MS scores can be as large as ± 16. These limits represent the range of variability consistent with no change and should be considered when interpreting individual change scores.

Type
DERIVED VARIABLES FOR THE CSHA
Information
International Psychogeriatrics , Volume 13 , Issue S1 , February 2001 , pp. 71 - 78
Copyright
© 2001 International Psychogeriatric Association

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