(a) Female
(b) Hemodialysis
(c)

Figure 2: Scatter plots of the iFR and FFR among women (a) and hemodialysis patients (b). Sensitivity, specificity, and diagnostic accuracy of iFR among the entire study population, women, and hemodialysis patients (c). Among women, diagnostic sensitivity was lower than that for the entire population (48% vs 78%, respectively). In contrast, the diagnostic specificity among hemodialysis patients was higher than that for the entire population (95% vs 69%, respectively). iFR: instantaneous wave-free ratio; FFR: fractional flow reserve.