Fig 2. Hemodynamic parameters of the 1^st dataset (n = 199). P_a.

= aortic pressure; BMR = basal coronary microvascular resistance; HMR = hyperemic coronary microvascular resistance; QCA = diameter reduction (%) by quantitative coronary analysis; ζ_L = pressure loss coefficient; FFR = fractional flow reserve. The table reports median ± robust standard deviations. The dendrogram represents the average-link similarities returned by an agglomerative hierarchical clustering. Modulus of the Spearman’s rank correlation coefficient (ρ) was used as a distance metric; it reflects the proximity between two objects by measuring at what point they are similar. Reported values = median (interquartile range).