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Head Circumference as a Measure of Cognitive Reserve

Association with Severity of Impairment in Alzheimer's Disease

Published online by Cambridge University Press:  02 January 2018

A. B. Graves*
Affiliation:
Battelle Memorial Institute, Seattle, WA 98105, currently at the Department of Epidemiology and Biostatistics, University of South Florida
J. A. Mortimer
Affiliation:
Veterans Affairs Medical Center, Geriatric Research Education and Clinical Center, Minneapolis, MN 55417, and University of Minnesota, Minneapolis, MN 55455, currently at the Institute on Aging, University of South Florida, Tampa, FL 33612
E. B. Larson
Affiliation:
Department of Medicine, University of Washington, Seattle, WA 98195
A. Wenzlow
Affiliation:
Battelle Centers for Public Health Research and Evaluation, 4000 N.E. 41st Street, Seattle, WA 98105
J. D. Bowen
Affiliation:
Division of Neurology, University of Washington, Seattle, WA 98195
W. C. McCormick
Affiliation:
Department of Medicine and Geriatrics, University of Washington, Seattle, WA 98195
*
Amy B. Graves, Department of Epidemiology and Biostatistics, College of Public Health, MDC-56, University of South Florida, 13201 Bruce B. Downs Blvd., Tampa, FL 33612-3805, USA

Abstract

Background

Recent studies suggest that larger brain size may offer some protection against the clinical manifestations of Alzheimer's disease. However, this association has not been investigated in population-based studies.

Method

The relationship between head circumference, a measure of premorbid brain size, and score on the Cognitive Abilities Screening Instrument (CASI) was studied in a population of 1985 Japanese–Americans aged 65+ living in King County, Washington, USA.

Results

After adjusting for age, sex and education, head circumference was positively associated with CASI score (b=3.8, 95% CI: 2.2, 5.4; P=0.0000), but not with diagnosis of probable AD (odds ratio=0.87, 95% CI: 0.33, 1.87). When the data were stratified by AD status, no association was seen among controls (b=1.6, 95% CI: – 1.7, 5.1; P=0.4), whereas a strong effect was present among cases (b=35.3, 95% CI: 12.2, 58.4: P=0.006).

Conclusions

These results suggest that persons with AD with smaller head circumference either had the disease longer or progressed more rapidly than those with larger head circumference. Improvement in environmental factors in prenatal and early life that partially determine completed brain/head size may have consequences for the late-life expression of Alzheimer's disease in vulnerable individuals.

Type
Papers
Copyright
Copyright © 1996 The Royal College of Psychiatrists 

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