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Mean frailty index score by chronologic age of the derivation Medicare Health Outcomes Survey cohort without cancer. Mean frailty score was strongly correlated with chronological age (r2 = 0.98; P < .001). The predicted mean frailty scores ranged from 0.15 for 66-year-olds to 0.52 for 110-year-olds (intercept = −0.40481; β coefficient = 0.00843 per year of age). The mean residual was 0.02.
