Table 1.
Baseline and Sleep Characteristics of the Cross-Sectional Study Cohort by Sleep Duration on Polysomnography
| Characteristic | Total Sleep Time |
||||
|---|---|---|---|---|---|
| ≥ 6 h (n = 3,989) | 5-6 h (n = 10,232) | 4-5 h (n = 8,624) | 3-4 h (n = 4,210) | < 3 h (n = 3,006) | |
| Age, y | 44.9 ± 13.9 | 47.8 ± 13.4 | 52.4 ± 13.8 | 55.8 ± 14.5 | 58.7 ± 14.8 |
| Female | 2,181/3,989 (54.7) | 5,429/10,231 (53.1) | 4,474/8,623 (51.9) | 2,044/4,210 (48.6) | 1,369/3,006 (45.5) |
| Race | |||||
| White | 3,230/3,989 (81.0) | 8,336/10,232 (81.5) | 7,141/8,624 (82.8) | 3,466/4,210 (82.3) | 2,454/3,006 (81.6) |
| Black | 535/3,989 (13.4) | 1,367/10,232 (13.4) | 1,106/8,624 (12.8) | 565/4,210 (13.4) | 416/3,006 (13.8) |
| Other | 224/3,989 (5.6) | 529/10,232 (5.2) | 377/8,624 (4.4) | 179/4,210 (4.3) | 136/3,006 (4.5) |
| BMI, kg/m2 | 32.8 ± 8.1 | 33.7 ± 8.4 | 34.4 ± 8.9 | 34.8 ± 9.2 | 35.5 ± 10.1 |
| Congestive heart failure | 191/3,989 (4.8) | 577/10,232 (5.6) | 744/8,624 (8.6) | 505/4,210 (12.0) | 495/3,006 (16.5) |
| COPD | 300/3,989 (7.5) | 845/10,232 (8.3) | 932/8,624 (10.8) | 627/4,210 (14.9) | 570/3,006 (19.0) |
| Hypertension | 1,233/3,989 (30.9) | 3,710/10,232 (36.3) | 3,787/8,624 (43.9) | 2,238/4,210 (53.2) | 1,670/3,006 (55.6) |
| Coronary artery disease | 323/3,989 (8.1) | 1,005/10,232 (9.8) | 1,227/8,624 (14.2) | 770/4,210 (18.3) | 688/3,006 (22.9) |
| Peripheral arterial disease | 109/3,989 (2.7) | 280/10,232 (2.7) | 337/8,624 (3.9) | 237/4,210 (5.6) | 221/3,006 (7.4) |
| Cerebrovascular disease | 120/3,989 (3.0) | 268/10,232 (2.6) | 322/8,624 (3.7) | 214/4,210 (5.1) | 173/3,006 (5.8) |
| Apnea-hypopnea index, h−1 | 13.9 ± 20.1 | 16.0 ± 20.3 | 19.9 ± 23.2 | 22.8 ± 26.1 | 27.0 ± 28.9 |
| N1 sleep, min | 15 ± 15 | 16 ± 18 | 18 ± 19 | 19 ± 21 | 18 ± 19 |
| N2 sleep, min | 275 ± 54 | 230 ± 44 | 196 ± 39 | 157 ± 35 | 94 ± 40 |
| N3 sleep, min | 35 ± 38 | 30 ± 34 | 22 ± 29 | 15 ± 23 | 8 ± 15 |
| R sleep, min | 65 ± 33 | 51 ± 27 | 36 ± 23 | 22 ± 19 | 10 ± 14 |
Values are reported as mean ± SD or No. of patients/total No. of patients (%). N1 = stage 1 nonrapid eye movement; N2 = stage 2 nonrapid eye movement; N3 = stage 3 nonrapid eye movement; R = rapid eye movement sleep stage.