Figure 1: Receiver operating characteristic (ROC) analysis of estimated GFR (right panel) and hemoglobin (Hb) level (left panel), indicating that optimal cutoff values for identifying cardiac events are 47.5ml/min/1.73 m2 (P<0.0001) for eGFR and 11.9 g/dL ( P<0.0001) for Hb level.