Baseline characteristics for patients used in the separate validation of the algorithm, n=50
| % Predicted | ||
| Sex, M/F | 25/25 | |
| Age, years | 64 (8) | |
| Lung function | ||
| FEV1, litres | 1.1 (0.4) | 40.2 (15.1) |
| FEV1/FVC | 0.41 (0.09) | |
| DL,CO, mmol/min/kPa | 3.0 (1.5) | 36 (17) |
| DL,CO/VA, mmol/min/kPa/litre | 0.6 (0.3) | 44 (21) |
| TLC, litres | 7.6 (1.6) | 127 (21) |
| RV, litres | 4.4 (1.3) | 198 (50) |
| Blood gases and pulse oximetry at sea level | ||
| PaO2, kPa | 9.0 (1.1) | |
| PaCO2, kPa | 5.1 (0.6) | |
| SpO2, % | 93 (3) | |
| Six min walk test | ||
| Distance, m | 425 (109) | |
| Exercise SpO2, % | 82 (4) | |
| Dyspnoea, Borg CR10 | 6.4 (2.2) | |
| HAST blood gases and pulse oximetry | ||
| PaO2, kPa | 6.5 (0.5) | |
| PaCO2, kPa | 4.9 (0.6) | |
| SaO2, % | 85 (4) | |
| SpO2, % | 85 (4) | |
Data are presented as n (%) and mean (SD).
DL,CO, diffusing capacity of the lung for carbon monoxide; FEV1%predicted, forced expiratory volume in 1 s in per cent of predicted; FVC, forced vital capacity; HAST, hypoxia-altitude simulation test; PaCO2, arterial carbon dioxide pressure; PaO2, arterial oxygen pressure; RV, residual volume; SaO2, arterial oxygen saturation; SpO2, arterial oxygen saturation by pulse oximetry; TLC, total lung capacity; VA, alveolar volume.