Results of polygraphy
| OSA | CSR | No SDB | |
| Patients n | 88 (43) | 57 (28) | 58 (29) |
| Epworth score | 8.5±0.7* | 6.7±0.7 | 5.8±0.8 |
| AHI n·h−1 | 34±2 | 35±3 | 4±1** |
| OAI n·h−1 | 28±2** | 4±2 | 2±1 |
| CAI n·h−1 | 2±1 | 27±3** | 1±1 |
| HI n·h−1 | 4±2 | 4±2 | 1±1 |
| Sa,O2 % | 93.1±0.3 | 93.0±0.4 | 94.1±0.4 |
| lowest Sa,O2 % | 74.4±0.4 | 77.3±0.5 | 88.1±0.5** |
| Sa,O2 <90% of TIB | 10.6±0.7** | 5.8±0.7 | 3.8±0.9 |
Data are presented as n (%) or mean±sem. OSA: obstructive sleep apnoea; CSR: Cheyne–Stokes respiration; SDB: sleep-disordered breathing; AHI: apnoea/hypopnoea index; OAI: obstructive apnoea index; CAI: central apnoea index; HI: hypopnoea index; Sa,O2: oxygen saturation; TIB: time in bed. *: p<0.05 and **: p<0.01 in comparison with the other two groups.