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Additive effect of pre-ICU frailty on hospital mortality for elderly Medicare beneficiaries stratified by age for A) Frailty only versus Robust, B) pre-ICU Cancer & Frailty versus pre-ICU Cancer only, C) pre-ICU Chronic Organ Failure & Frailty versus pre-ICU Chronic Organ Failure only D) pre-ICU Cancer, Chronic Organ Failure & Frailty versus pre-ICU Cancer & Chronic Organ Failure
