Table 1.
Descriptive statistics for patients referred to an overnight sleep study due to a clinical suspicion of obstructive sleep apnea (sleep study group) and general population sample who responded to all SF-36 questionnaire domains.
| Normal | Obstructive sleep apnea | Total | General population | p** | |||
|---|---|---|---|---|---|---|---|
| Mild | Moderate | Severe | 418 | 5000 | |||
| AHI* | <5 | 5–14 | 15–29 | ≥30 | |||
| N | 194 | 111 | 60 | 53 | |||
| Mean (SD) or N (%)** | Mean (SD) or N (%)** | Mean (SD) or N (%)** | Mean (SD) or N (%)** | Mean (SD) or N (%)** | Mean (SD) or N (%)** | ||
| Age, years | 43.7 (12.1) | 49.7 (11.2) | 52.2 (9.9) | 50.8 (10.1) | 47.4 (11.9) | 46.7 (16.5) | 0.37 |
| Male gender | 105 (54) | 82 (74) | 50 (83) | 49 (92) | 286 (68) | 2435 (49) | <0.001 |
| Body mass index, kg/m² | 27.4 (5.1)1 | 28.7 (4.8) | 29.8 (4.5) | 32.7 (5.9) | 28.8 (5.3) | 24.8 (5.1)2 | <0.001 |
| Education | <0.001 | ||||||
| Schooling up to 10 years | 34 (18) | 28 (25) | 14 (24) | 13 (25) | 89 (22) | 659 (13) | |
| Schooling 11–13 years | 76 (40) | 42 (38) | 20 (34) | 20 (39) | 158 (38) | 2816 (57) | |
| University or college degree | 81 (42) | 41 (37) | 25 (42) | 18 (35) | 165 (40) | 1471 (30) | |
| Current smoker | 63 (33)1 | 31 (28) | 17 (28) | 20 (38)3 | 131 (32) | 1825 (37)4 | 0.044 |
| Epworth sleepiness scale >10 | 87 (47)5 | 42 (42)6 | 24 (44)7 | 28 (55)8 | 181 (46) | ||
| High blood pressure | 17 (11)9 | 14 (15)10 | 12 (25)11 | 12 (30)12 | 55 (17) | ||
| Diabetes mellitus | 8 (5)9 | 8 (9)10 | 4 (8)11 | 5 (13)12 | 25 (8) | ||
| Anxiety or depression | 34 (23)9 | 10 (11)10 | 13 (27)11 | 7 (18)12 | 64 (19) | ||
*Apnea-hypopnea index.
**Continuous variables are presented using mean (SD), and categorical variables using number (percent).
***Comparison of total sleep group and general population using the t-test for continuous and Chi-square test for discrete variables.
1N = 192.
2N = 4926.
3N = 52.
4N = 4998.
5N = 187.
6N = 101.
7N = 54.
8N = 51.
9N = 151.
10N = 91.
11N = 48.
12N = 40.