A, Receiver operating characteristic (ROC) curves comparing discrimination of mortality with REVEAL Registry risk score (in blue) to discrimination of mortality with points added to REVEAL Registry to incorporate ST2 (in red) (+1 has been added for ST2 measurements in the 4th quintile of ST2 and +2 has been added for 5th quintile of ST2) (area under the curve [AUC], 0.68 vs AUC, 0.72; P < .001), and B, ROC curves comparing discrimination of mortality with REVEAL Registry 2.0 risk score (in blue) to discrimination of mortality with points added to REVEAL Registry 2.0 to incorporate ST2 (in red), as previously described (AUC, 0.70 vs AUC, 0.73; P < .001). See Figure 1 legend for expansion of abbreviations.