Outcome  | All patients | PaCO2 group |  | PaO2 group |  | ||||
---|---|---|---|---|---|---|---|---|---|
 | Hypocapnia | Normocapnia | Hypercapnia | P value | Hypoxia | Normoxia | Hyperoxia | P value | |
Intensive care unit mortality | 2491 (47.4) | 576 (50.7) | 976 (42.7) | 939 (51.2) | <0.001 | 244 (58.4) | 2171 (46.2) | 76 (52.8) | <0.001 |
In-hospital mortality | 2833 (53.9) | 663 (58.4) | 1129 (49.3) | 1041 (56.8) | <0.001 | 266 (63.6) | 2484 (52.9) | 83 (57.6) | <0.001 |