Table 1.
Baseline Characteristics of Participants in Tianning Cohort According to Night-Time Sleep Duration (N=5130)
| Characteristics | Sleep Duration (h/Night) | P value | ||
|---|---|---|---|---|
| <6 | 6–8.9 | ≥9 | ||
| No. of participants | 358 | 4319 | 453 | – |
| Sex, men (%) | 141 (39.4) | 1772 (41.0) | 207 (45.7) | 0.118 |
| Age, years | 55.7 ± 14.3† | 50.7 ± 15.4 | 50.2 ± 18.5* | <0.001 |
| Education level, years, median (IQR) | 9 (8–12)† | 11 (9–14) | 9 (9–12) | <0.001 |
| Cigarette smoking, n (%) | 64 (17.9) | 857 (19.8) | 98 (21.6) | 0.411 |
| Alcohol consumption, n (%) | 68 (19.0) | 798 (18.5) | 86 (19.0) | 0.943 |
| Body mass index, kg/m2 | 24.01 ± 3.91 | 24.08 ± 3.60 | 23.78 ± 3.80 | 0.232 |
| Systolic blood pressure, mmHg | 125.6 ± 16.5 | 124.0 ± 16.7 | 124.8 ±18.6 | 0.180 |
| Diastolic blood pressure, mmHg | 76.7 ± 10.4 | 76.7 ± 11.2 | 77.1 ± 10.4 | 0.798 |
| Hypertension, n (%) | 161 (45.0) | 1686 (39.2) | 190 (42.0) | 0.060 |
| Obstructive sleep apnea syndrome, n (%) | 2 (0.6) | 29 (0.7) | 8 (1.8)† | 0.048 |
| Diabetes mellitus, n (%) | 61 (17.0) | 662 (15.4) | 59 (13.1) | 0.291 |
| Total cholesterol, mmol/L | 4.94 ± 0.93† | 4.80 ± 0.94 | 4.72 ± 0.89* | 0.003 |
| Triglyceride, mmol/L | 1.79 ± 1.22 | 1.77 ± 1.26 | 1.76 ± 1.10 | 0.922 |
| LDL-C, mmol/L | 2.82 ± 0.80 | 2.75 ± 0.79 | 2.74 ± 0.78 | 0.256 |
| HDL-C, mmol/L | 1.23 ± 0.32† | 1.22 ± 0.31 | 1.18 ± 0.28*† | 0.013 |
| Depressive symptom, points, median (IQR) | 1 (0–12)† | 0 (0–5) | 0 (0–5)* | <0.001 |
| Physically active, n (%) | 285 (79.6) | 3236 (74.9) | 310 (68.4)*† | 0.001 |
| Ankle branchial index | 1.09 ± 0.13† | 1.08 ± 0.15 | 1.06 ± 0.17*† | 0.003 |
| Peripheral artery disease, n (%) | 31 (8.7) | 438 (10.1) | 62 (13.7) | 0.034 |
Notes: †P<0.05 compared with participants with a sleep duration of 6–8.9 hours. *P<0.05 compared with participants with a sleep duration of <6 hours. Results presented as mean ± standard deviation, unless otherwise noted. Bolding represented P<0.05.
Abbreviations: LDL-C, low density lipoprotein cholesterol; HDL-C, high density lipoprotein cholesterol; IQR, interquartile range.