IL6 and acute respiratory distress syndrome: In contrast, the concentrations of IL-1Ra (p<0.0001 and p<0.0001, respectively; Figure 3B) and IL-6 concentrations (p<0.0001 and p<0.0001, respectively; Figures 3C) were well detectable in the serum and significantly higher in C-ARDS and NC-ARDS than in controls.