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Figure 3 Predictive accuracy (ROC curve) of the prestent vessel angulation for predicting MACE (left). The closer the ROC curve is to the upper left-hand corner of the graph, the more accurate it is, because the true-positive rate is 1 and the false-positive rate is zero. Additional delineation of sensitivity and specificity curves relating to each prestent vessel angulation value and the determination of a cut-off point for the same sensitivity and specificity for predicting MACE (right). MACE = major adverse cardiac events; ROC = receiver operating curve.