Fig. 6

Changes in the ratio of arterial partial pressure of oxygen to fraction of inspired oxygen (ΔPaO₂/FiO₂) and static compliance of the respiratory system (ΔCstat), subgrouped by ARDS severity on day 1 (A,C) and day 2 (B,D). Data are presented as mean ± SD. Differences were analyzed using Student’s t-test. Numbers inside the bars indicate the number of participants.