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ROC curves were calculated using RFR as the reference gold standard. The threshold cut-off for RFR was ≤0.89. The optimal CT-FFR cutoff value for predicting RFR 0.89 was 0.815 (sensitivity 69.6%, specificity 95.7%, Youden index 0.65). CTA, computed tomography angiography; CT-FFR, coronary computed tomography angiography based fractional flow reserve; RFR, resting full cycle Ratio; ROC, receiver operating characteristic curves.
