Table 1: Demographic, anthropometric, and clinical characteristics of all participants.
| Variable | N (%) N = 243 | Mean ± SD1 |
| Age (years) | 48.7 ± 13.2 | |
| Gender | ||
| Male | 137 (56) | |
| Female | 106 (44) | |
| Race | ||
| Caucasian | 129 (53) | |
| African-American | 97 (40) | |
| Other Races | 17 (7) | |
| BMI2 (kg/m2) | 35.4 ± 8.2 | |
| Neck circumference (inches) | 16.2 ± 1.8 | |
| Snoring | 192 (79) | |
| Breathing pauses | 104 (43) | |
| History of systemic hypertension | ||
| 156 (64) | ||
| History of heart disease | 33 (14) | |
| History of stroke | 15 (6) | |
| History of diabetes mellitus | 56 (23) | |
| History of lung disease | 69 (28) | |
| History of depression | 96 (40) | |
| Tobacco smoking | 43 (18) | |
| Alcohol use | ||
| None | 70 (29) | |
| Moderate | 132 (54) | |
| Heavy | 41 (17) | |
| Recreational drug use | 44 (18) | |
| Epworth sleepiness scale score | 16.2 ± 1.8 | |
| Fatigue sleepiness scale score | 38.3 ± 14.4 | |
1Standard Deviation; 2Body Mass Index.