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Correlation between FFR and iFR/RFR in (A) GFR-L group and (B) GFR-H group of patients (linear fit, confidence bar, and confidence ellipse for prediction). FFR, fractional flow reserve; (e)GFR, (estimated) glomerular filtration rate; iFR, instantaneous wave-free ratio; RFR, resting full-cycle ratio; L, indicates the group with an eGFR 70 mL/min/1.73 m2; H, indicates the group with an eGFR 70 mL/min/1.73 m2.
