Cut-off analysis for initial PaCO2 in arterial blood gas
| Adjusted OR (95% CI) | P value | AUROC (95% CI) | |
| ≤35 versus >35 | 0.87 (0.26 to 2.99) | 0.829 | 0.875 (0.805 to 0.934) |
| ≤40 versus >40 | 2.80 (0.96 to 8.16) | 0.059 | 0.878 (0.810 to 0.947) |
| ≤45 versus >45 | 7.63 (2.31 to 25.18) | 0.001 | 0.905 (0.85 to 0.968) |
| ≤50 versus >50 | 17.12 (3.63 to 81.15) | 0.001 | 0.897 (0.828 to 0.966) |
| ≤55 versus >55 | 8.94 (1.13 to 70.86) | 0.038 | 0.879 (0.808 to 0.949) |
All values are reported in mm Hg.
AUROC, area under the receiver operating characteristic; PaCO2, partial pressure of carbondioxide.