di: Deficit Index (DI)
A set of utilities for calculating the Deficit (frailty) Index (DI) in gerontological studies.
The deficit index was first proposed by Arnold Mitnitski and Kenneth Rockwood
and represents a proxy measure of aging and also can be served as
a sensitive predictor of survival. For more information, see
(i)"Accumulation of Deficits as a Proxy Measure of Aging"
by Arnold B. Mitnitski et al. (2001),
The Scientific World Journal 1, <doi:10.1100/tsw.2001.58>;
(ii) "Frailty, fitness and late-life mortality in relation to chronological and biological age"
by Arnold B Mitnitski et al. (2001),
BMC Geriatrics2002 2(1), <doi:10.1186/1471-2318-2-1>.
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