Relationship between ratio of Th17/Treg cells and acute physiology and chronic health evaluation (APACHE) II, sequential organ failure assessment (SOFA) or lung injury score, or arterial partial pressure of oxygen/inspired oxygen fraction (PaO
) in patients with acute respiratory distress syndrome (ARDS). Spearman rank correlation was tested between variables. The ratio of Th17/Treg cells was positively correlated with APACHE II score (A), SOFA score (B), and lung injury score (C), while it was negatively correlated with PaO2/FiO2
(D) in ARDS patients.