Characteristics | Total | Snorers | OSA | p-value# |
Subjects n | 130 | 49 | 81 | |
Age yrs | 53.6 (0.9) | 51.9 (1.5) | 54.7 (1.1) | ns |
BMI kg·m−2 | 31.8 (0.6) | 31.5 (1.0) | 32.0 (0.7) | ns |
Neck circumference cm | 41.4 (0.3) | 39.8 (0.4) | 42.3 (0.4) | 0.001 |
AHI n·h−1 | 32.2 (2.4) | 8.4 (0.6) | 46.6 (2.8) | 0.001 |
Minimal Sa,O2 % | 78.3 (0.71) | 82.8 (0.7) | 75.5 (0.9) | 0.001 |
Mean Sa,O2 % | 91.8 (0.2) | 92.6 (0.3) | 91.3 (0.3) | 0.001 |
Stage 1 % | 18.3 (0.7) | 14.5 (0.7) | 20.7 (1.0) | 0.001 |
Stage 2 % | 52.9 (0.9) | 51.8 (1.2) | 53.7 (1.2) | ns |
Stages 3–4 % | 12.0 (0.7) | 15.0 (0.9) | 10.2 (0.9) | 0.001 |
Stage REM % | 17.1 (0.5) | 19.3 (0.8) | 15.8 (0.5) | 0.001 |
TTS min | 404.5 (5.7) | 417.0 (8.4) | 396.1 (7.4) | ns |
WASO min | 101.7 (4.9) | 92.6 (7.1) | 107.3 (6.5) | ns |
SE % | 76.4 (1.1) | 77.6 (2.1) | 75.7 (1.2) | ns |
Awakenings n | 17.7 (1.1 | 16.2 (1.4) | 18.6 (1.6) | ns |
Macroarousals n | 347.8 (15.9) | 255.1 (12.5) | 404.6 (22.2) | 0.001 |
SSS | 2.6 (0.1) | 2.5 (0.1) | 2.7 (0.1) | ns |
ESS | 10.6 (0.4) | 10.5 (0.6) | 10.6 (0.6) | ns |
VAS | 2.6 (0.2) | 2.4 (0.2) | 2.7 (0.2) | ns |
MWT min | 22.3 (1.1) | 25.1 (1.6) | 20.5 (1.4) | 0.04 |
Data are presented mean±sem
BMI: body mass index
AHI: apnoea/hypopnoea index
Sa,O2: arterial oxygen saturation
REM: rapid eye movement
TTS: total sleep time
WASO: wake after sleep onset
SE: sleep efficiency
SSS: Stanford Sleepiness Scale
ESS: Epworth Sleepiness Scale
VAS: Visual Analogue Scale
MWT: mean sleep latency at the Maintenance Wakefulness Test
ns: nonsignificant
#: Mann-Whitney U-test