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June 09, 2009; 72 (23) Articles

Predictors of maintaining cognitive function in older adults

The Health ABC Study

K. Yaffe, A. J. Fiocco, K. Lindquist, E. Vittinghoff, E. M. Simonsick, A. B. Newman, S. Satterfield, C. Rosano, S. M. Rubin, H. N. Ayonayon, T. B. Harris
First published June 8, 2009, DOI: https://doi.org/10.1212/WNL.0b013e3181a92c36
K. Yaffe
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A. J. Fiocco
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K. Lindquist
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E. Vittinghoff
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E. M. Simonsick
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A. B. Newman
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S. Satterfield
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C. Rosano
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S. M. Rubin
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H. N. Ayonayon
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T. B. Harris
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Citation
Predictors of maintaining cognitive function in older adults
The Health ABC Study
K. Yaffe, A. J. Fiocco, K. Lindquist, E. Vittinghoff, E. M. Simonsick, A. B. Newman, S. Satterfield, C. Rosano, S. M. Rubin, H. N. Ayonayon, T. B. Harris
Neurology Jun 2009, 72 (23) 2029-2035; DOI: 10.1212/WNL.0b013e3181a92c36

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Abstract

Background: Although several risk factors for cognitive decline have been identified, much less is known about factors that predict maintenance of cognitive function in advanced age.

Methods: We studied 2,509 well-functioning black and white elders enrolled in a prospective study. Cognitive function was measured using the Modified Mini-Mental State Examination at baseline and years 3, 5, and 8. Random effects models were used to classify participants as cognitive maintainers (cognitive change slope ≥0), minor decliners (slope <0 and >1 SD below mean), or major decliners (slope ≤1 SD below mean). Logistic regression was used to identify domain-specific factors associated with being a maintainer vs a minor decliner.

Results: Over 8 years, 30% of the participants maintained cognitive function, 53% showed minor decline, and 16% had major cognitive decline. In the multivariate model, baseline variables significantly associated with being a maintainer vs a minor decliner were age (odds ratio [OR] = 0.65, 95% confidence interval [CI] 0.55–0.77 per 5 years), white race (OR = 1.72, 95% CI 1.30–2.28), high school education level or greater (OR = 2.75, 95% CI 1.78–4.26), ninth grade literacy level or greater (OR = 4.85, 95% CI 3.00–7.87), weekly moderate/vigorous exercise (OR = 1.31, 95% CI 1.06–1.62), and not smoking (OR = 1.84, 95% CI 1.14–2.97). Variables associated with major cognitive decline compared to minor cognitive decline are reported.

Conclusion: Elders who maintain cognitive function have a unique profile that differentiates them from those with minor decline. Importantly, some of these factors are modifiable and thus may be implemented in prevention programs to promote successful cognitive aging. Further, factors associated with maintenance may differ from factors associated with major cognitive decline, which may impact prevention vs treatment strategies.

Glossary

3MS=
Modified Mini-Mental State Examination;
BMI=
body mass index;
CES-D=
Center for Epidemiologic Studies–Depression Scale score;
CI=
confidence interval;
CRP=
C-reactive protein;
Health ABC=
Health, Aging and Body Composition;
IL=
interleukin;
MI=
myocardial infarction;
OR=
odds ratio;
REALM=
Rapid Estimate of Adult Literacy in Medicine;
TNF=
tumor necrosis factor.
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