Baseline charateristics
| HOT (n=10) | HMV (n=10) | |
| Age (years) | 68±9 | 70±10 |
| BMI (kgm−2) | 26±6 | 21±3 |
| FEV1 (l)/(%) | 0.73±0.34/31±7 | 0.56±0.16/22±12 |
| FVC (l)/(%) | 1.79±0.56/65±12 | 1.72±0.64/48±18 |
| PaCO2 (kPa) | 7.94±0.73 | 8.22±0.71 |
| PaO2 (kPa) | 6.88±1.01 | 6.54±0.81 |
| HCO3 (mmol/l) | 35±3 | 37±4 |
| MRC (/5) | 4±1 | 5±1 |
| SGRQ (/100) | 63±12 | 66±14 |
| SRI-SS (/100) | 49±14 | 52±16 |
| O2 prescription (L/min) | 1.2±0.7 | 1.0±0.4 |