Fig. 1

The distribution, survival prediction and kinetics of IL-6 in patients with SARS-CoV-2 infection. a The baseline level of serum IL-6 in 901 patients who were classified into three distinct prognostic subgroups (common, severe, and critical) based on clinical characteristics. b The typical dynamics of serum IL-6 in these three subgroups. ys years, M male, F female. Day 0: the day patient took the first IL-6 examination. * means P < 0.01. c Receiver operating characteristic curve was applied to identify the cut-off of IL-6 for prediction of in-hospital death in this cohort (N = 901) (P < 0.001)