Figure 1

Receiver-operating curve showing the relationship between cardiac troponin I elevation and death (n = 514). The best threshold (0.30 ng.mL^-1) was associated with a sensitivity of 0.66 and a specificity of 0.66 (arrow). The threshold retained to define severe myocardial damage (1.50 ng.mL^-1; see Methods) was associated with a sensitivity of 0.33 and a specificity of 0.89 (arrow). The area under the ROC curve was 0.68 (95% confidence interval 0.63 to 0.73) and was significantly different (P < 0.001) from the no discrimination curve (dotted line).