Fig. 3

ROC curve for diagnosis of AMI in the total study population. The optimal cutoff-value for diagnosis of AMI in all suspicious patients, which appeared to be an hs-TnI level of 1.15 ng mL−1 with 82.5% sensitivity and 95.4% specificity. AUC was 0.924 [95% CI (0.914, 0.933)]. AMI acute myocardial infarction, hs-cTnI high-sensitive cardiac troponin I; AUC area under the curve, ROC receiver-operating characteristic