Table 2.
Demographics, risk factors, and BP values across categories of sleep hours Variable Sleep Hours
| Variable | Sleep Hours
|
||
|---|---|---|---|
| <6 48 (6%) |
6 to 10:59 628 (83%) |
≥11 80 (11%) |
|
| Women | 25 (6) | 380 (84) | 49 (10) |
| White | 11 (11) | 82 (81) | 7 (7) |
| Black | 12 (10) | 100 (84) | 7 (6) |
| Hispanic* | 25 (5) | 450 (83) | 66 (12) |
| Less than high school* | 18 (4) | 341 (82) | 59 (14) |
| Hypertension† | 41 (8) | 431 (81) | 60 (11) |
| Diabetes | 12 (6) | 177 (81) | 29 (13) |
| Hypercholesterolemia† | 27 (6) | 384 (81) | 61 (13) |
| Ever smoker† | 32 (8) | 339 (84) | 34 (8) |
| Waist (cm) | 38 ± 4 | 38 ± 5 | 38 ± 5 |
| Obesity (BMI ≥30 kg/m2) | 13 (6) | 192 (81) | 31 (13) |
| Serum creatinine >1.5 mg/dl† | 5 (23) | 15 (68) | 2 (9) |
| Daytime systolic BP† | 130 ± 13 | 128 ± 14 | 132 ± 16 |
| Nighttime systolic BP* | 121 ± 16 | 118 ± 16 | 124 ± 17 |
| Daytime diastolic BP | 77 ± 9 | 74 ± 9 | 74 ± 10 |
| Nighttime diastolic BP | 68 ± 11 | 66 ± 9 | 68 ± 9 |
| 24-mean systolic BP | 128 ± 13 | 124 ± 14 | 128 ± 15 |
| 24-mean diastolic BP | 75 ± 9 | 71 ± 8 | 71 ± 9 |
| BP nondipping status†,‡ | 30 (6) | 383 (81) | 58 (12) |
| LV mass index (g/m2)* | 110 ± 26 | 102 ± 27 | 111 ± 28 |
Data are expressed as mean ± SD or as n (%).
BMI = body mass index.
*
p <0.001.
†
p <0.05.
‡
Less than 10% decrease in nighttime versus daytime BP.