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Ability to Walk 1/4 Mile Predicts Subsequent Disability, Mortality, and Health Care Costs

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ABSTRACT

Background

Mobility, such as walking 1/4 mile, is a valuable but underutilized health indicator among older adults. For mobility to be successfully integrated into clinical practice and health policy, an easily assessed marker that predicts subsequent health outcomes is required.

Objective

To determine the association between mobility, defined as self-reported ability to walk 1/4 mile, and mortality, functional decline, and health care utilization and costs during the subsequent year.

Design

Analysis of longitudinal data from the 2003–2004 Medicare Current Beneficiary Survey, a nationally representative sample of Medicare beneficiaries.

Participants

Participants comprised 5895 community-dwelling adults aged 65 years or older enrolled in Medicare.

Main Measures

Mobility (self-reported ability to walk 1/4 mile), mortality, incident difficulty with activities of daily living (ADLs), total annual health care costs, and hospitalization rates.

Key Results

Among older adults, 28% reported difficulty and 17% inability to walk 1/4 mile at baseline. Compared to those without difficulty and adjusting for demographics, socioeconomic status, chronic conditions, and health behaviors, mortality was greater in those with difficulty [AOR (95% CI): 1.57 (1.10-2.24)] and inability [AOR (CI): 2.73 (1.79-4.15)]. New functional disability also occurred more frequently as self-reported ability to walk 1/4 mile declined (subsequent incident disability among those with no difficulty, difficulty, or inability to walk 1/4 mile at baseline was 11%, 29%, and 47% for instrumental ADLs, and 4%, 14%, and 23% for basic ADLs). Total annual health care costs were $2773 higher (95% CI $1443-4102) in persons with difficulty and $3919 higher (CI $1948-5890) in those who were unable. For each 100 persons, older adults reporting difficulty walking 1/4 mile at baseline experienced an additional 14 hospitalizations (95% CI 8-20), and those who were unable experienced an additional 22 hospitalizations (CI 14-30) during the follow-up period, compared to persons without walking difficulty.

Conclusions

Mobility disability, a simple self-report measure, is a powerful predictor of future health, function, and utilization independent of usual health and demographic indicators. Mobility disability may be used to target high-risk patients for care management and preventive interventions.

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Acknowledgments

This research was supported by the National Institute on Aging (R03AG032291) and the Pittsburgh Claude D. Pepper Older Americans Independence Center (NIA P30 AG-024827). Dr. Hardy is supported by a Beeson Career Development Award (K23AG030977) from the NIA, the John A. Hartford Foundation, the Atlantic Philanthropies, and the Starr Foundation. The funders had no role in the design or conduct of the study. Portions of this work were presented at the Gerontological Society of America Annual Meeting in Atlanta, GA, on November 19, 2009.

Conflict of Interest

None disclosed.

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Correspondence to Susan E. Hardy MD, PhD.

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Hardy, S.E., Kang, Y., Studenski, S.A. et al. Ability to Walk 1/4 Mile Predicts Subsequent Disability, Mortality, and Health Care Costs. J GEN INTERN MED 26, 130–135 (2011). https://doi.org/10.1007/s11606-010-1543-2

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