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The Journals of Gerontology Series A: Biological Sciences and Medical Sciences 56:M146-M157 (2001)
© 2001 The Gerontological Society of America

Frailty in Older Adults

Evidence for a Phenotype

Linda P. Frieda, Catherine M. Tangenb, Jeremy Walstona, Anne B. Newmanc, Calvin Hirschd, John Gottdienere, Teresa Seemanf, Russell Tracyg, Willem J. Koph, Gregory Burkei and Mary Ann McBurnie, for the Cardiovascular Health Study Collaborative Research Groupb

a The John Hopkins Medical Institutions, Baltimore, Maryland
b The University of Washington, Seattle
c The University of Pittsburgh, Pennsylvania
d The University of California at Davis, Sacramento
e St. Francis Hospital, Roslyn, New York
f The University of California at Los Angeles
g The University of Vermont, Burlington
h Uniformed Services University of the Health Sciences, Bethesda, Maryland
i Wake Forest University School of Medicine, Winston-Salem, North Carolina

Linda P. Fried, Director, Center on Aging and Health, The Johns Hopkins Medical Institutions, 2024 East Monument Street, Suite 2-700, Baltimore, MD 21205 E-mail: lfried{at}welch.jhu.edu.

Decision Editor: John E. Morley, MB, BCh

Background. Frailty is considered highly prevalent in old age and to confer high risk for falls, disability, hospitalization, and mortality. Frailty has been considered synonymous with disability, comorbidity, and other characteristics, but it is recognized that it may have a biologic basis and be a distinct clinical syndrome. A standardized definition has not yet been established.

Methods. To develop and operationalize a phenotype of frailty in older adults and assess concurrent and predictive validity, the study used data from the Cardiovascular Health Study. Participants were 5,317 men and women 65 years and older (4,735 from an original cohort recruited in 1989–90 and 582 from an African American cohort recruited in 1992–93). Both cohorts received almost identical baseline evaluations and 7 and 4 years of follow-up, respectively, with annual examinations and surveillance for outcomes including incident disease, hospitalization, falls, disability, and mortality.

Results. Frailty was defined as a clinical syndrome in which three or more of the following criteria were present: unintentional weight loss (10 lbs in past year), self-reported exhaustion, weakness (grip strength), slow walking speed, and low physical activity. The overall prevalence of frailty in this community-dwelling population was 6.9%; it increased with age and was greater in women than men. Four-year incidence was 7.2%. Frailty was associated with being African American, having lower education and income, poorer health, and having higher rates of comorbid chronic diseases and disability. There was overlap, but not concordance, in the cooccurrence of frailty, comorbidity, and disability. This frailty phenotype was independently predictive (over 3 years) of incident falls, worsening mobility or ADL disability, hospitalization, and death, with hazard ratios ranging from 1.82 to 4.46, unadjusted, and 1.29–2.24, adjusted for a number of health, disease, and social characteristics predictive of 5-year mortality. Intermediate frailty status, as indicated by the presence of one or two criteria, showed intermediate risk of these outcomes as well as increased risk of becoming frail over 3–4 years of follow-up (odds ratios for incident frailty = 4.51 unadjusted and 2.63 adjusted for covariates, compared to those with no frailty criteria at baseline).

Conclusions. This study provides a potential standardized definition for frailty in community-dwelling older adults and offers concurrent and predictive validity for the definition. It also finds that there is an intermediate stage identifying those at high risk of frailty. Finally, it provides evidence that frailty is not synonymous with either comorbidity or disability, but comorbidity is an etiologic risk factor for, and disability is an outcome of, frailty. This provides a potential basis for clinical assessment for those who are frail or at risk, and for future research to develop interventions for frailty based on a standardized ascertainment of frailty.




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