Risk of one-month and one-year all-cause mortality according to the four frailty instruments in hospitalized older patients.

*continuous variables.**p-values obtained fitting univariate proportional hazard regression models, accounting for clustering due to centre effect.HR: hazard ratio; CI: confidence intervals; FI-SOF: Frailty Index derived from the Study of Osteoporotic Fractures; FI-CD: Frailty Index based on cumulative deficits; FI-CGA: Frailty Index based on a Comprehensive Geriatric Assessment; MPI: Multidimensional Prognostic Index.