Anthropometric, clinical and polysomnographic data of patients with and without daytime sleepiness
| ESS<10 | ESS>10 | SL>20 | SL<20 | |
| Subjects n | 25 | 23 | 30 | 18 |
| Age yrs | 49.6±3.0 | 49.2±2.3 | 53.8±2.4 | 42.1±2.1 ** |
| BMI kg·m−2 | 31.3±1.2 | 32.8±1.3 | 31.8±1.0 | 32.4±1.7 |
| AHI n·h−1 | 31.6±5.8 | 37.9±5.4 | 37.1±5.2 | 30.5±6.2 |
| Minimal Sa,O2 % | 74.6±2.4 | 72.9±1.8 | 74.9±1.8 | 72.1±2.7 |
| TTS min | 426.1±17.4 | 446.8±13.9 | 416.6±14.3 | 468.5±15.7 ** |
| WASO min | 141.1±18.5 | 111.8±13.7 | 147.6±15.0 | 92.7±16.4** |
| SE % | 75.7±3.2 | 80.2±2.3 | 74.4±2.5 | 83.7±2.8** |
| Sleep stage change n | 264.0±25.0 | 298.2±19.4 | 290.5±21.3 | 263.7±23.9 |
| Awakening n | 17.5±2.1 | 19.6±3.3 | 19.4±2.3 | 17.0±3.4 |
| Arousal n | 181.9±21.5 | 209.3±28.5 | 180.8±20.3 | 218.7±32.6 |
| SL min | 26.7±2.4 | 20.5±2.5 | 31.4±1.4 | 11.1±1.4** |
| SSS | 1.9±0.1 | 2.6±0.2 ** | 2.1±0.2 | 2.5±0.12 |
| ESS | 7.2±0.4 | 13.8±0.7 | 9.8±0.7 | 11.4±1.1 |
| VAS | 1.3±0.3 | 2.5±0.3* * | 1.6±0.3 | 2.4±0.4 |
Data presented as mean±se unless otherwise stated
SL: mean sleep latency in the maintenance wakefulness test
ESS: Epworth Sleepiness Scale
BMI: body mass index
AHI: apnoea/hypopnoea index
TST: total sleep time
WASO: wake after sleep onset
SE: sleep efficiency
SSS: Stanford Sleepiness Scale
VAS: Visual Analogue Scale
AAC; alpha attenuation coefficient
**: p<0.01 Mann Whitney U test