Fig. 3

Mortality across oxygenation groups, including hyperoxia subgroups. Hypoxia, partial pressure of arterial oxygen (PaO2) <60 mm Hg; normoxia, PaO2 60–120 mm Hg; mild hyperoxia, PaO2 121–200 mm Hg; moderate hyperoxia, PaO2 201–300 mm Hg; severe hyperoxia, PaO2 > 300 mm Hg