Fig. 2From: The role of cell-free hemoglobin and haptoglobin in acute kidney injury in critically ill adults with ARDS and therapy with VV ECMOAssociation of CFH concentrations with AKI and grouping. Comparison of CFH concentrations between patients with and without AKI (A). Incidence of AKI with 95% confidence intervals across different CFH concentrations (B). Risk grouping according to the sensitivity and specificity analysis of CFH concentration for occurrence of AKI (C). Cutoffs with 90% sensitivity and 90% specificity are used to group patients into the three CFH concentrations groups. Distribution of the CFH concentration within each group (D). ***P < 0.001. Se, Sensitivity; Sp, SpecificityBack to article page