Fig. 2.

Representation of the ROC curves and AUC for predicting the diagnosis of NSTI. a Lactate dehydrogenase (LDH) in fluids (AUC = 0.955), b Light’s criteria (total score) (AUC = 0.925), c fluid-to-serum LDH ratio (AUC = 0.929), and d fluid-to-serum total protein ratio (AUC = 0.927) Additional plots of ROC curves for other biochemical tests and extravascular body fluid criteria are shown in Additional file 3. AUC, area under the receiver operating characteristic curve; ROC, receiver operating characteristic; NSTI, necrotizing soft tissue infection