Fig. 1From: End-tidal to arterial PCO2 ratio: a bedside meter of the overall gas exchanger performancePanel A: PETCO2/PaCO2 ratio among acute respiratory distress syndrome (ARDS) groups divided in Severe, Moderate–Severe (MS), Moderate–Mild (MM) and Mild groups at 5 cmH2O of positive end-expiratory pressure (PEEP). *p < 0.001, Mann–Whitney testBack to article page