All patients | AHI# <20 events·h−1 | AHI# ≥20 events·h−1 | |
Subjects | 84 | 45 | 39 |
AHI events·h−1 | 18 (9–35) | 10 (4–14) | 36 (25–48)¶ |
ODI events·h−1 | 17 (8–34) | 9 (4–14) | 35 (25–50)¶ |
CSA % | 22 (14–27) | 21 (0–28) | 23 (18–27) |
Berlin Questionnaire score 2–3 | 37 (46) | 17 (38) | 20 (56) |
ESS | 4 (3–8) | 4 (3–8) | 5 (3–8) |
Excessive daytime sleepiness (ESS >10) | 8 (10) | 7 (16) | 1 (3) |
Arousal index events·h−1 | 20 (13–29) | 15 (10–22) | 23 (17–31)*** |
SaO2 nadir % | 85 (80–88) | 86 (83–89) | 81 (78–86)*** |
SaO2 mean % | 94 (92–95) | 94 (92–95) | 94 (92–95) |
SaO2 T90 min | 4 (1–21) | 1 (0–10) | 7 (2–51)** |
Data are presented as n, median (interquartile range) or n (%). AHI: apnoea/hypopnoea index; ODI: oxygen desaturation index; CSA: central sleep apnoea; ESS: Epworth Sleepiness Scale; SaO2: arterial oxygen saturation; T90: time below 90% saturation. #: comparisons between the two groups were performed using the Mann–Whitney U-test for continuous variables and the Fisher’s exact test for categorical variables; ¶: p<0.0001. **: p<0.01; ***: p<0.001.