REM AHI severity category | Total | ||||
---|---|---|---|---|---|
<1 | 1–4.9 | 5–14.9 | ≥15 | ||
N | 73 | 60 | 38 | 28 | 199 |
Male, % | 47 | 63 | 66 | 82 | 60 |
Age, years, mean (SD) | 46 (8) | 49 (7) | 50 (7) | 49 (9) | 48 (8) |
Body mass index, kg/m2, mean (SD) | 27 (4) | 27 (4) | 30 (4) | 31 (5) | 28 (4) |
Race/ethnicity, white, % | 99 | 98 | 95 | 100 | 98 |
Current smoking, % | 16 | 17 | 18 | 21 | 17 |
Alcohol, number of drinks/week (SD) | 4 (5) | 3 (5) | 5 (6) | 5 (6) | 4 (6) |
Prevalent hypertension, % | 4 | 23 | 13 | 57 | 19 |
Type 2 diabetes, % | 0 | 0 | 0 | 0 | 0 |
Waist-to-hip ratio, mean (SD) | 0.9 (0.1) | 0.9 (0.1) | 0.9 (0.1) | 1.0 (0.1) | 0.9 (0.1) |
AHI, mean (SD) | 0.6 (1) | 3 (5) | 4 (3) | 18 (19) | 4 (9) |
NREM AHI, mean (SD) | 0.7 (1) | 3 (6) | 3 (3) | 15 (20) | 4 (9) |
REM AHI, mean (SD) | 0.2 (0.3) | 3 (1) | 8 (2) | 30 (13) | 7 (11) |
Minutes total sleep time, mean (SD) | 393 (55) | 393 (54) | 371 (69) | 404 (66) | 391 (60) |
Minutes REM sleep, mean (SD) | 76 (27) | 77 (28) | 70 (25) | 66 (25) | 74 (27) |
Percent REM sleep, mean (SD) | 19 (6) | 19 (6) | 19 (5) | 16 (5) | 19 (6) |
Minutes slow wave sleep, mean (SD) | 43 (29) | 45 (37) | 37 (31) | 36 (35) | 41 (33) |
Percent slow wave sleep, mean (SD) | 11 (7) | 12 (9) | 9 (7) | 9 (9) | 11 (8) |
Epworth Sleepiness Scale*, mean (SD) | 9 (4) | 9 (4) | 9 (3) | 12 (4) | 9 (4) |
Excessive daytime sleepiness, % | 26 | 12 | 29 | 21 | 22 |
*Only available on a subset of studies (n=110).
AHI, apnoea hypopnoea index; NREM, non-rapid eye movement; REM, rapid eye movement.