Additional file 1: Fig. S1. Receiver operation characteristic (ROC) curves and the area under the ROC curve (AUC) demonstrating the diagnostic ability of laboratory data in infectious fascial fluid to predict the diagnosis of NF. The optimal cuff of value of each ROC curve was shown in the figure. (a) Albumin in fluid, (b) LDH in fluid, (c) glucose in fluid, (d) total protein in fluid, (e) lactate in fluid, and (f) pH of fluid.