Table 2.
Baseline characteristics by obstructive sleep apnea (OSA) categories, Atherosclerosis Risk in Communities (ARIC) study, 1996–1998
| OSA Categories (AHI) | ||||
|---|---|---|---|---|
|
|
||||
| AHI N |
Normal (<5) 849 |
Mild (5 to <15) 503 |
Moderate (15 to <30) 213 |
Severe (>30) 102 |
| Age, years | 62.0 (5.5) | 63.4 (5.3) | 63.6 (5.4) | 63.9 (5.4) |
| Female, % | 64.6 | 45.1 | 30.5 | 35.3 |
| Education level, % | ||||
| <High school | 8.9 | 13.3 | 14.1 | 9.8 |
| High school graduate | 47.7 | 45.5 | 43.7 | 52.0 |
| College/Graduate school | 43.4 | 41.2 | 42.2 | 38.2 |
| APOE genotype, % | ||||
| e4/e4 | 2.9 | 2.6 | 1.9 | 4.9 |
| e2/e4 or e3/e4 | 25.4 | 22.8 | 23.0 | 26.5 |
| Other | 66.4 | 69.2 | 71.8 | 63.7 |
| Missing | 5.2 | 5.4 | 3.3 | 4.9 |
| Smoking status, % | ||||
| Current | 13.8 | 6.6 | 7.0 | 6.9 |
| Former | 44.3 | 52.3 | 54.5 | 53.9 |
| Never | 41.9 | 41.1 | 38.5 | 39.2 |
| Body mass index, kg/m2 | 27.1 (4.3) | 29.3 (4.7) | 31.2 (5.5) | 34.1 (5.4) |
| Prevalent diabetes, % | 8.4 | 15.9 | 13.6 | 20.6 |
| C-reactive protein, mg/L* | 2.1 (3.6) | 2.2 (3.6) | 2.3 (3.7) | 3.4 (5.8) |
| Leisure index | 2.5 (0.5) | 2.4 (0.5) | 2.4 (0.5) | 2.3 (0.5) |
| Antihypertensive medications, % | 31.6 | 39.2 | 41.3 | 49.0 |
| Systolic blood pressure, mmHg | 123.2 (17.1) | 128.0 (18.5) | 126.6 (18.0) | 130.7 (17.0) |
Data shown as mean (SD) or percentage except for *geometric mean (interquartile range)