Risk of hospital admission
| OR (95% CI) | p Value | |
| (1) Unadjusted analysis | ||
| High concentration oxygen* | 2.29 (1.03 to 5.10) | 0.042 |
| (2) Adjusted analysis | ||
| High concentration oxygen | 1.70 (0.68 to 4.26) | 0.257 |
| Baseline oxygen saturation (per %) | 0.80 (0.66 to 0.98) | 0.028 |
| Baseline Ptco2 (per mm Hg) | 1.04 (0.96 to 1.12) | 0.370 |
| Baseline FEV1 (per litre) | 0.31 (0.10 to 0.94) | 0.039 |
↵* High concentration oxygen versus titrated oxygen.
FEV1, forced expiratory volume in 1 s; Ptco2, transcutaneous partial pressure of carbon dioxide.