Table 1.
Description of the screening sample and the clinical sample
| Screening sample | Participants | p Value | |
|---|---|---|---|
| n = 3,960 | n = 290 | ||
| Age in years, mean (SD) | 48.8 (10.3) | 48.2 (11.2) | 0.357 |
| Male gender, n (%) | 2,198 (55.5) | 162 (55.9) | 0.899 |
| Higher education, n (%) | 80 (28.1) | ||
| Body mass index, mean (SD) | 29.1 (5.2) | 29.0 (4.9) | 0.951 |
| Smoking, n (%) | 89 (31.0) | ||
| Alcohol abuse, n (%) | 5 (1.7) | ||
| Berlin Questionnaire | |||
| Snoring category, n (%) | 3,654 (92.3) | 264 (91.0) | 0.412 |
| Daytime somnolence category, n (%) | 2,498 (63.1) | 205 (70.7) | 0.005 |
| Hypertension/obesity category, n (%) | 2,624 (66.3) | 193 (66.6) | 0.914 |
| Sleepiness and comorbidities | |||
| Epworth Sleepiness Scale, mean (SD) | 8.8 (4.5) | 9.5 (4.2) | <0.001 |
| Excessive daytime sleepiness, n (%) | 1,336 (33.7) | 117 (40.9) | <0.001 |
| Self-reported asthma, n (%) | 597 (16.5) | 50.0 (18.8) | 0.289 |
| Polysomnography indices | |||
| AHI, median (25th and 75th percentiles) | 7.7 (2.4, 22.2) | ||
| Arousal index, mean (SD) | 19.9 (15.9) | ||
| Nadir oxygen saturation, median (25th and 75th percentiles) | 86.0 (82.0, 89.0) | ||
| Average oxygen saturation, mean (SD) | 94.3 (2.0) | ||
| Relevant standard blood tests | |||
| Blood hemoglobina, mean (SD) | 15.1 (1.2) | ||
| Serum ferritinb, mean (SD) | 121.5 (96.0) | ||
AHI apnea–hypopnea index, SD standard deviation
aGram/deciliter
bMicrogram/liter