Fig. 3

Mortality across oxygenation groups, including hyperoxia subgroups. Hypoxia, partial pressure of arterial oxygen (P_aO₂) <60 mm Hg; normoxia, P_aO₂ 60–120 mm Hg; mild hyperoxia, P_aO₂ 121–200 mm Hg; moderate hyperoxia, P_aO₂ 201–300 mm Hg; severe hyperoxia, P_aO₂ > 300 mm Hg