Table 1 Characteristics of the study subjects according to sleep duration levels
From: The relation between habitual sleep duration and blood pressure values in Japanese male subjects
Total (n = 1,670) | Sleep duration | P value | ||||
|---|---|---|---|---|---|---|
<6 (n = 201) | 6- (n = 628) | 7- (n = 638) | ≥8 (n = 203) | |||
Age (years) | 50 ± 6 | 48 ± 5 | 49 ± 6 | 51 ± 6 | 51 ± 5 | <0.001 |
Body mass index (kg/m2) | 23.8 ± 2.8 | 24.4 ± 3.1 | 23.8 ± 2.8 | 23.6 ± 2.6 | 23.8 ± 2.8 | <0.05 |
Smoking (%) | 52.2 | 54.7 | 52.1 | 51.7 | 51.5 | 0.90 |
Alcohol (%) | 74.3 | 74.1 | 73.6 | 71.2 | 85.2 | <0.01 |
Exercise (%) | 28.2 | 20.9 | 31.7 | 27.2 | 27.9 | <0.05 |
Dyslipidemia (%) | 4.0 | 4.0 | 3.5 | 3.8 | 6.4 | 0.32 |
Diabetes mellitus (%) | 3.2 | 1.5 | 3.8 | 3.3 | 2.5 | 0.38 |
Family history of hypertension (%) | 15.6 | 21.4 | 16.9 | 14.6 | 9.4 | <0.01 |
Total cholesterol (mg/dL) | 208 ± 33 | 206 ± 36 | 208 ± 31 | 208 ± 34 | 208 ± 33 | 0.90 |
Triglyceride (mg/dL) | 106 (76–150) | 104 (76–150) | 127 (87–173) | 105 (73–146) | 104 (75–152) | <0.05 |
HDL-cholesterol (mg/dL) | 57 ± 14 | 56 ± 13 | 57 ± 15 | 56 ± 14 | 59 ± 15 | <0.05 |
Glucose (mg/dL) | 96 ± 20 | 94 ± 12 | 96 ± 19 | 97 ± 20 | 97 ± 24 | 0.13 |