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Figure 3 (Thickest curve) The receiver-operating characteristic (ROC) curve for the validation sample of 616 subjects in whom the peripheral arterial tonometer (PAT) outcome was used in combination with the electrocardiograph (ECG) result (PAT enhanced). The area under the curve (AUC) was 0.72. At a specificity value of 67.8%, the sensitivity of the combined PAT and ECG model was 62.4%, compared with 44.7% for ECG alone (p < 0.0001). The specificity value selected represents the specificity value of ECG for this study population. (Thinner curve) The ROC curve for the validation sample of 616 subjects in whom only the PAT outcome (PAT alone) was used. The AUC was 0.675. At a specificity value of 67.8%, the sensitivity of PAT was 58.4%, compared with 44.7% for ECG alone (p < 0.01).