1. Comparing Models of Frailty: The Health and Retirement Study
- Author
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Cigolle, Christine T., Ofstedal, Mary Beth, Tian, Zhiyi, and Blaum, Caroline S.
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Aged -- Analysis ,Aged -- Social aspects ,Chronic diseases -- Analysis ,Chronic diseases -- Social aspects ,Health ,Seniors - Abstract
To authenticate to the full-text of this article, please visit this link: http://dx.doi.org/10.1111/j.1532-5415.2009.02225.x Byline: Christine T. Cigolle (*[dagger]), Mary Beth Ofstedal ([double dagger]), Zhiyi Tian (s.), Caroline S. Blaum ([dagger]s.) Keywords: frailty; disability; chronic disease Abstract: OBJECTIVES: To operationalize and compare three models of frailty, each representing a distinct theoretical view of frailty: as deficiencies in function (Functional Domains model), as an index of health burden (Burden model), and as a biological syndrome (Biologic Syndrome model). DESIGN: Cross-sectional analysis. SETTING: 2004 wave of the Health and Retirement Study, a nationally representative, longitudinal health interview survey. PARTICIPANTS: Adults aged 65 and older (N=11,113) living in the community and in nursing homes in the United States. MEASUREMENTS: The outcome measure was the presence of frailty, as defined according to each frailty model. Covariates included chronic diseases and sociodemographic characteristics. RESULTS: Almost one-third (30.2%) of respondents were frail according to at least one model; 3.1% were frail according to all three models. The Functional Domains model showed the least overlap with the other models. In contrast, 76.1% of those classified as frail according to the Biologic Syndrome model and 72.1% of those according to the Burden model were also frail according to at least one other model. Older adults identified as frail according to the different models differed in sociodemographic and chronic disease characteristics. For example, the Biologic Syndrome model demonstrated substantial associations with older age (adjusted odds ratio (OR)=10.6, 95% confidence interval (CI)=6.1-18.5), female sex (OR=1.7, 95% CI=1.2-2.5), and African-American ethnicity (OR=2.1, % CI=1.0-4.4). CONCLUSION: Different models of frailty, based on different theoretical constructs, capture different groups of older adults. The different models may represent different frailty pathways or trajectories to adverse outcomes such as disability and death. Author Affiliation: (*)Department of Family Medicine ([double dagger])Institute for Social Research, and (s.)Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan; and ([dagger])Geriatric Research, Education and Clinical Center, Ann Arbor Veterans Affairs Healthcare System, Ann Arbor, Michigan. Article note: Address correspondence to Christine T. Cigolle, University of Michigan 300 N. Ingalls, Room 919, Ann Arbor, MI 48109. E-mail: ccigolle@umich.edu
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- 2009