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Receiver Operating Characteristic (ROC) curve comparisons and corresponding Area Under the ROC curves (AUC) between the Frailty Index (solid line) and the Frailty Phenotype (dashed line) for measuring improvement and deterioration in frailty status according to the health and functioning anchor questions after three (left) and twelve (right) months post discharge. The diagonal lines (gray) represent the reference lines of no-discrimination
