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Health Literacy, Cognitive Ability, and Functional Health Status among Older Adults

Authors

  • Marina Serper,

    Corresponding author
    1. Health Literacy and Learning Program, Division of General Internal Medicine and Geriatrics, Northwestern University Feinberg School of Medicine, Chicago, IL
    • Address correspondence to Marina Serper, Division of General Internal Medicine and Geriatrics, Northwestern University, Feinberg School of Medicine, 750 N. Lakeshore Dr. 10th floor, Chicago, IL 60611; e-mail: marina.serper@fsm.northwestern.edu.

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  • Rachel E. Patzer Ph.D., M.P.H.,

    1. Division of Transplantation, Department of Surgery, Emory University School of Medicine, Atlanta, GA
    2. Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, GA
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  • Laura M. Curtis M.S.,

    1. Health Literacy and Learning Program, Division of General Internal Medicine and Geriatrics, Northwestern University Feinberg School of Medicine, Chicago, IL
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  • Samuel G. Smith B.Sc., M.Sc., Ph.D.,

    1. Health Literacy and Learning Program, Division of General Internal Medicine and Geriatrics, Northwestern University Feinberg School of Medicine, Chicago, IL
    2. Health Behaviour Research Centre, Department of Epidemiology and Public Health, University College London, London, UK
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  • Rachel O'Conor M.P.H.,

    1. Health Literacy and Learning Program, Division of General Internal Medicine and Geriatrics, Northwestern University Feinberg School of Medicine, Chicago, IL
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  • David W. Baker M.D., M.P.H.,

    1. Health Literacy and Learning Program, Division of General Internal Medicine and Geriatrics, Northwestern University Feinberg School of Medicine, Chicago, IL
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  • Michael S. Wolf Ph.D., M.P.H.

    1. Health Literacy and Learning Program, Division of General Internal Medicine and Geriatrics, Northwestern University Feinberg School of Medicine, Chicago, IL
    2. Department of Learning Sciences, School of Education and Social Policy, Northwestern University, Evanston, IL
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Abstract

Objective

To investigate whether previously noted associations between health literacy and functional health status might be explained by cognitive function.

Data Sources/Study Setting

Health Literacy and Cognition in Older Adults (“LitCog,” prospective study funded by National Institute on Aging). Data presented are from interviews conducted among 784 adults, ages 55–74 years receiving care at an academic general medicine clinic or one of four federally qualified health centers in Chicago from 2008 to 2010.

Study Design

Study participants completed structured, in-person interviews administered by trained research assistants.

Data Collection

Health literacy was measured using the Test of Functional Health Literacy in Adults, Rapid Estimate of Adult Literacy in Medicine, and Newest Vital Sign. Cognitive function was assessed using measures of long-term and working memory, processing speed, reasoning, and verbal ability. Functional health was assessed with SF-36 physical health summary scale and Patient Reported Outcomes Measurement Information System short form subscales for depression and anxiety.

Principal Findings

All health literacy measures were significantly correlated with all cognitive domains. In multivariable analyses, inadequate health literacy was associated with worse physical health and more depressive symptoms. After adjusting for cognitive abilities, associations between health literacy, physical health, and depressive symptoms were attenuated and no longer significant.

Conclusions

Cognitive function explains a significant proportion of the associations between health literacy, physical health, and depression among older adults. Interventions to reduce literacy disparities in health care should minimize the cognitive burden in behaviors patients must adopt to manage personal health.

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