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FI is defined as the proportion of deficits present in an individual out of the total number of age-related health variables considered. A frailty index can be created in most secondary data sources related to health by utilizing health deficits that are routinely collected in
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For example, a person with 20 of 40 deficits collected has an FI score of 20/40 = 0.5; whilst for someone with 10 deficits, the FI score is 10/40 = 0.25. The FI takes advantage of the high redundancy in the human organism. This is why it is replicable across different
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even when different items and different numbers of items are used. The standard procedure for creating a frailty index are found in an open-access publication.
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There are several frailty indices, including a clinical deficits frailty index (FI-CD) and a biomarker-based frailty index (FI-B).
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Searle, Samuel D; Mitnitski, Arnold; Gahbauer, Evelyne A; Gill, Thomas M; Rockwood, Kenneth (September 30, 2008).
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Peña, Fernando G.; Theou, Olga; Wallace, Lindsay; Brothers, Thomas D.; Gill, Thomas M.; Gahbauer, Evelyne A.;
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Frailty Index (FI) = (number of health deficits present) ÷ (number of health deficits measured)
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FI was developed by Dr. Kenneth
Rockwood and Dr. Arnold Mitnitski at
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Index used to measure the health status of older individuals
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Mitnitski, Arnold; Collerton, Joanna; Martin-Ruiz, Carmen;
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