Basic information for all subjects
| Characteristics | COPD (n=19) | Overlap (n=16) | Normal (n=12) | OSA (n=14) |
|---|---|---|---|---|
| Age (years) | 62.0±9.2 | 61.5±10.2 | 58.1±8.3 | 55.8±8.9 |
| BMI (kg/m2) | 19.9±2.7 | 23.5±3.8 | 22.3±2.8 | 25.8±3.7 |
| FVC%pred | 73.7±19.9 | 68.5±17.4 | 98.6±9.6 | 100±12.6 |
| FEV1%pred | 38.5±16.3 | 47.5±16.2 | 98.1±9.2 | 99.1±14.6 |
| FEV1/FVC% | 41.3±11.2 | 54.6±11.4 | 79.6±3.4 | 80.4±6.3 |
| mMRC | 1.8±0.9 | 1.6±0.5 | 0±0 | 0±0 |
| EMGdi-max (μV) | 176.9±72.1 | 192.3±56.6 | 156.1±50.3 | 166.2±40.8 |
| EMGdi-rest (μV) | 29.5±13.3 | 29.3±15.8 | 12.6±3.7 | 14.2±7.9 |
| AHI (events/hour) | 1.9±1.6 | 20.5±14.1 | 1.6±1.4 | 25.6±18 |
| TST (hours) | 4.4±2.0 | 3.9±1.8 | 4.2±1.4 | 5.6±1.8 |
| Rest SaO2 (%) | 96.8±1.4 | 97.1±1.3 | 98.0±1.0 | 96.9±0.7 |
| Mean SaO2 (%) | 96.0±1.6 | 95.8±1.4 | 97.6±0.9 | 96.1±1.4 |
| Mini SaO2 (%) | 90.6±5.3 | 90.9±3.9 | 93.6±2.4 | 85.3±8.7 |
| TB90% | 4.7±5.5 | 0.4±0.5 | – | 2.2±5.5 |
AHI, Apnoea Hypopnoea Index; BMI, body mass index; EMGdi-max, the maximum of the diaphragm electromyogram; mean SaO2, mean nocturnal oxygen saturation; mini SaO2, minimum nocturnal oxygen saturation; mMRC, modified British Medical Research Council; TB90%, time spent with saturation below 90%; TST, total sleep time.