Baseline participant characteristics
| Characteristic | NHF manual N=10 | NHF automatic N=10 |
| Sex | ||
| Female | 4 | 4 |
| Ethnicity | ||
| European | 9 | 10 |
| Pacific peoples | 1 | 0 |
| Reason for oxygen | ||
| Exacerbation of asthma | 2 | 1 |
| Exacerbation of COPD | 3 | 3 |
| Heart failure | 1 | 1 |
| Interstitial lung disease | 1 | 1 |
| Pulmonary embolism | 1 | 0 |
| Pneumonia | 2 | 4 |
| Target SpO2 range | ||
| 88%–92% | 5 | 6 |
| 92%–96% | 5 | 4 |
| High-dependency area | ||
| Yes | 5 | 4 |
| Mean (SD) | ||
| Age (years) | 69.2 (19) | 68.7 (17) |
| Heart rate (beats/min) | 80.2 (17.2) | 89.9 (15.1) |
| Respiratory rate | 21.7 (3.3) | 23.4 (5.9) |
| Systolic blood pressure | 130 (20) | 118.1 (16.1) |
| Diastolic blood pressure | 70.4 (9) | 72.3 (10.7) |
| Baseline FiO2 (%) | 30.6 (3.5) | 28.3 (2) |
COPD, chronic obstructive pulmonary disease; FiO2, fractional inspired oxygen; SpO2, oxygen saturation.