Table 1.
Baseline characteristics of study participants
| Obstructive AHI Category |
Biomarker Subset* | |||
|---|---|---|---|---|
| <5 Events/h | 5 to <15 Events/h | ≥15 Events/h | ||
| Participants, n | 600 | 547 | 543 | 99 |
| Age, yr | 67 ± 9 | 69 ± 9 | 69 ± 9 | 69 ± 8 |
| Female | 67% | 54% | 38% | 48% |
| Race/ethnicity | ||||
| White | 37% | 38% | 30% | 37% |
| African-American | 29% | 27% | 27% | 31% |
| Hispanic | 21% | 23% | 29% | 18% |
| Asian | 13% | 12% | 14% | 14% |
| Body mass index, kg/m2 | 27 ± 5 | 29 ± 5 | 31 ± 6 | 28 ± 4 |
| <25 kg/m2 | 41% | 23% | 15% | 21% |
| 25–30 kg/m2 | 36% | 43% | 35% | 56% |
| >30 kg/m2 | 23% | 34% | 50% | 22% |
| Height, cm | 164 ± 10 | 165 ± 10 | 167 ± 10 | 166 ± 10 |
| Weight, kg | 73 ± 16 | 78 ± 15 | 86 ± 18 | 76 ± 14 |
| Waist circumference, cm | 94 ± 14 | 100 ± 13 | 104 ± 14 | 97 ± 10 |
| Hip circumference, cm | 103 ± 11 | 106 ± 11 | 109 ± 12 | 103 ± 8 |
| Smoking status | ||||
| Never-smokers | 51% | 45% | 45% | 49% |
| Former smokers | 41% | 47% | 49% | 49% |
| Current smokers | 8% | 8% | 6% | 3% |
| Education | ||||
| Less than high school | 15% | 14% | 17% | 14% |
| High school | 44% | 47% | 47% | 38% |
| College | 41% | 39% | 36% | 48% |
| Resting SpO2, % | 96 ± 1.2 | 96 ± 1.4 | 96 ± 1.3 | 96 ± 1.4 |
| Forced vital capacity, % predicted | 97 ± 17 | 98 ± 19 | 97 ± 17 | 100 ± 17 |
Definition of abbreviations: AHI = apnea–hypopnea index; SpO2 = oxygen saturation as measured by pulse oximetry.
*
Data are presented as means ± SD and as percentages.