Figures 3A and 3B. Maximum PaO2 and mortality.

(A) Maximum PaO2 is significantly higher in patients who died in hospital in unadjusted analysis (P=0.017 by Kruskal-Wallis test). (B) Maximum PaO2 exhibited behavior similar to a dose-dependent effect on hospital mortality (P = 0.015 by linear-by-linear test).