Figure 3

Prediction of CAD and coronary revascularization by ROC derived ASI cut-offs. While an ASI > 1.54 proved to be the optimal discriminator for presence of significant coronary artery disease (A), the need for coronary revascularization was best predicted by a slightly higher ASI cut-off of 1.6 (B). For both, the sensitivities were 59%, the specificity for prediction of CAD was 86% (positive predictive value 84%) and the specificity for precition of coronary revascularization was 90% (positive predictive value 63%).