Figure 2. A: Comparison of Th17/Treg ratio among patients with different length of hospital stay; B: Correlation between Th17/Treg and length of ICU stay; C: Correlation between SOFA score and Th17/Treg ratio; D: Correlation between APACHE II score and Th17/Treg ratio. SOFA, Sequential Organ Failure Assessment; APACHE II, Acute Physiology and Chronic Health Assessment II. ** p < 0.01.