Cardio-respiratory polygraphy results of the ISAACC patients according to apnoea–hypopnoea index (AHI)
| AHI | p-value# | ||
| <15 events·h−1 | ≥15 events·h−1 | ||
| Patients n | 298 | 680 | |
| AHI events·h−1 | 6 (3–10) | 32 (22–46) | <0.001 |
| Oxygen desaturation index >4% h−1 | 5 (2–10) | 26 (16–42) | <0.001 |
| Mean SaO2 % | 92.7±4 | 92.0±4 | 0.018 |
| Minimum SaO2 % | 84.4±11 | 81.0±10 | <0.001 |
| Time with SaO2 <90% % | 0.6 (0–6.1) | 4.3 (0.9–19) | <0.001 |
Data are presented as mean±sd or median (interquartile range), unless otherwise stated. SaO2 : arterial oxygen saturation; AHI: apnoea–hypopnoea index. #: t-test or Kruskal–Wallis test as appropriate.