| Sleep apnoea | Obesity hypoventilation | |
| Subjects | 30 278 (100) | 1562 (100) |
| Age years | ||
| <20 | 2998 (9.9) | 8 (0.5) |
| 20–29 | 1339 (4.4) | 46 (2.9) |
| 30–39 | 3687 (12.2) | 156 (10.0) |
| 40–49 | 6621 (21.9) | 311 (19.9) |
| 50–59 | 8473 (28.0) | 474 (30.3) |
| 60–69 | 5347 (17.7) | 368 (23.6) |
| 70–79 | 1583 (5.2) | 161 (10.3) |
| ≥80 | 230 (0.8) | 38 (2.4) |
| Male | 76.6 | 69.9 |
| Marital or cohabiting status | ||
| Patients | 66.2 | 63.4 |
| Controls | 65.4 | 65.6 |
Data are presented as n (%) or %.