Associations between outcomes and oxygen usage
| Variable* | No oxygen (n=111) | Oxygen (n=xx71) | Difference (95% CI) | P value† |
| Mean emPHasis-10 score (SD)‡ | 22.5 (12.0) | 32.5 (8.4) | 7.4 (5.0 to 9.9) | <0.001 |
| Mean FSS score (SD)‡ | 4.5 (1.7) | 5.5 (1.4) | 0.8 (0.5 to 1.2) | <0.001 |
| Mean MOS-Sleep Index (SD)‡ | 37.2 (19.6) | 42.2 (18.6) | 3.1 (−1.2 to 7.4) | 0.16 |
| Mean HADS-Anxiety score (SD)‡ | 5.8 (4.4) | 8.0 (4.3) | 1.6 (0.7 to 2.6) | 0.001 |
| Mean HADS-Depression score (SD)‡ | 4.6 (3.4) | 7.1 (3.7) | 1.7 (0.9 to 2.5) | <0.001 |
| Median Dyspnoea-12 score (IQR)§ | 6 (1–14) | 15 (9–22) | 1.93 (1.55 to 2.42) | <0.001 |
*Mean values for total scores across all time points combined.
†P values indicate significance of the overall difference between the four time points.
‡For variables found to be approximately normally distributed, mean and SD were summarised: mean difference using oxygen versus no oxygen.
§For the variable found to be non-normally distributed, the median and IQR preferred was summarised, and the ratio of scores in participants using oxygen versus no oxygen is reported on a log scale.
FSS, Fatigue Severity Scale; HADS, Hospital Anxiety and Depression Scale; MOS, Medical Outcomes Study.