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ROC curves for multivariate and univariate analyses. A, Receiver operating characteristic (ROC) curve and corresponding area under the curve (AUC) statistics for the risk score of death with age >75 y; platelets <150 × 103/mm3; ferritin >750 ng/mL. N = 229. B, ROC curve and AUC statistics for age >75 y (n = 42); platelets < 150×103/mm3 (n = 52); ferritin > 750 ng/mL (n = 99)
