Comparison of a multidomain frailty index from routine health data with the hospital frailty risk score in older patients in an Australian hospital.

Although the eFI-AH and the HFRS did not consistently identify the same inpatients as frail, both were associated with adverse outcomes and they had comparable predictive ability for prolonged hospitalisation. These two constructs of frailty may have different implications for clinical practice and health service provision and planning.