IL6 and bacterial pneumonia: Spearman's rank correlation test revealed that BALF HBP and IL-6 concentrations and N% were lowly correlated with blood HBP and IL-6 concentrations and N% in children with bacterial pneumonia (r = 0.439, P < 0.001; r = 0.250, P = 0.005; r = 0.235, P = 0.008).