Fig. 2

Receiver-operating characteristic (ROC) curve analysis for predicting GIB after CABG. A For CRUSADE risk score alone, the area under the curve (AUC) was 0.667 (95% CI 0.597–0.737); B When RDW was added to CRUSADE risk score, the AUC was 0.677 (95% CI 0.606–0.748, P-value for comparison = 0.023). RDW, red cell distribution width; GIB, gastrointestinal bleeding; CABG, coronary artery bypass grafting; CI, confidence interval