Table 1.
Baseline characteristics according to sleep duration.
| Variable | Sleep duration (hours) | p value | |||
|---|---|---|---|---|---|
| Total (n = 87693) | ≤6.0 (n = 21191) | 7 (n = 17035) | ≥8.0 (n = 49467) | ||
| Age, years | 50.54 ± 11.96 | 52.95 ± 11.55 | 50.44 ± 12.14 | 49.54 ± 11.92 | <0.01 |
| Gender male, n (%) | 68974 (78.65) | 17767 (83.37) | 13582 (79.73) | 37725 (76.26) | <0.01 |
| High school or above, n (%) | 18344 (20.92) | 4741 (22.37) | 5364 (31.49) | 8239 (16.66) | <0.01 |
| Current smoker, n (%) | 30489 (34.77) | 10487 (49.49) | 8087 (47.47) | 11915 (24.09) | <0.01 |
| Current alcohol, n (%) | 33375 (38.06) | 11470 (54.13) | 9091 (53.37) | 12814 (25.90) | <0.01 |
| Active physical activity, n (%) | 13680 (15.60) | 5133 (24.22) | 4074 (23.92) | 4473 (9.04) | <0.01 |
| Snoring, n (%) | 12455 (14.20) | 4933 (23.28) | 3353 (19.68) | 4169 (8.43) | <0.01 |
| Hypertension, n (%) | 37594 (42.87) | 9619 (45.39) | 6750 (39.62) | 21225 (42.91) | <0.01 |
| Diabetes mellitus, n (%) | 7777 (8.87) | 2167 (10.23) | 1482 (8.70) | 4128 (8.34) | <0.01 |
| Dyslipidemia, n (%) | 31201 (35.58) | 8376 (39.53) | 6365 (37.36) | 16460 (33.27) | <0.01 |
| Myocardial infarction, n (%) | 1051 (1.20) | 463 (2.19) | 236 (1.39) | 352 (0.71) | <0.01 |
| Body Mass Index, kg/m2 | 25.07 ± 3.47 | 25.09 ± 3.42 | 25.09 ± 3.43 | 25.05 ± 3.50 | 0.06 |
| Systolic blood pressure, mmHg | 130.24 ± 20.69 | 131.49 ± 20.67 | 129.27 ± 20.52 | 130.04 ± 20.73 | <0.01 |
| Diastolic blood pressure, mmHg | 83.37 ± 11.69 | 83.55 ± 11.50 | 82.58 ± 11.37 | 83.57 ± 11.88 | <0.01 |
| Fasting blood glucose, mmol/L | 5.46 ± 1.62 | 5.48 ± 1.66 | 5.42 ± 1.51 | 5.46 ± 1.64 | 0.43 |
| Total cholesterol, mmol/L | 4.96 ± 1.15 | 5.00 ± 1.20 | 4.97 ± 1.21 | 4.93 ± 1.11 | <0.01 |
| Triglycerides, mmol/L | 1.68 ± 1.38 | 1.70 ± 1.39 | 1.67 ± 1.37 | 1.67 ± 1.38 | 0.04 |
| Low-density lipoprotein, mmol/L | 2.36 ± 0.88 | 2.46 ± 0.88 | 2.46 ± 0.88 | 2.29 ± 0.88 | <0.01 |
| High-density lipoprotein, mmol/L | 1.54 ± 0.40 | 1.55 ± 0.40 | 1.52 ± 0.39 | 1.55 ± 0.39 | <0.01 |
| Uric acid, µmol/L | 288.9 ± 83.0 | 299.8 ± 85.6 | 301.4 ± 87.0 | 280.0 ± 79.3 | <0.01 |
| High sensitivity C-reactive protein, mg/L | 0.79 (0.30–2.0) | 0.80 (0.30–1.94) | 0.80 (0.30–1.90) | 0.76 (0.28–2.09) | 0.33 |