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Correlation and agreement between QFR and pre-PCI FFR and residual QFR and post-PCI FFR. Scatterplots with corresponding correlation coefficients and Bland–Altman plots with ICCs demonstrating the correlation and level of agreement between QFR and pre-PCI FFR and residual QFR and post-PCI FFR. FFR, fractional flow reserve; PCI, percutaneous coronary intervention; QFR, quantitative flow ratio; CI, confidence interval; ICC, intraclass correlation coefficient; SD, standard deviation.
