Clinical characteristics of study participants
| Men (n=3,613) | Women (n=4,592) | P-value | |
|---|---|---|---|
| Age (y) | 41.74±0.248 | 42.47±0.238 | <0.001 |
| Height (cm) | 172.29±0.126 | 159.30±0.108 | <0.001 |
| Weight (kg) | 73.39±0.223 | 58.62±0.177 | 0.005 |
| Body mass index (kg/m2) | 24.68±0.066 | 23.11±0.072 | 0.274 |
| Waist circumference (cm) | 86.04±0.180 | 77.13±0.213 | <0.001 |
| Systolic blood pressure (mmHg) | 119.15±0.271 | 112.06±0.276 | <0.001 |
| Diastolic blood pressure (mmHg) | 79.38±0.199 | 73.70±0.185 | <0.001 |
| Anemia | 58 (1.60) | 551 (12.00) | <0.001 |
| Hemoglobin (g/dL) | 15.46±0.024 | 13.12±0.023 | <0.001 |
| Hematocrit (%) | 47.06±0.075 | 40.85±0.069 | <0.001 |
| Red blood cell count (Mil/uL) | 5.06±0.009 | 4.43±0.007 | <0.001 |
| White blood cell count (Thous/uL) | 6.72±0.038 | 5.97±0.030 | 0.269 |
| C-reactive protein (mg/L) | 1.25±0.035 | 0.98±0.023 | 0.001 |
| Sleep duration (h) | 7.14±0.022 | 7.24±0.022 | 0.023 |
| <5 | 109 (3.02) | 133 (2.90) | |
| 5–6 | 315 (8.72) | 441 (9.61) | |
| 6–7 | 987 (27.32) | 1,167 (25.41) | |
| 7–8 | 1,301 (36.00) | 1,515 (32.99) | |
| 8–9 | 669 (18.52) | 964 (20.99) | |
| ≥9 | 232 (6.42) | 372 (8.10) | |
| Urban residence | 3,114 (86.19) | 3,990 (86.89) | 0.733 |
| Currently smoking | 1,485 (41.10) | 289 (6.29) | <0.001 |
Values are presented as number (%) or mean±standard deviation.
P-values were calculated by Student’s t-test or Chi-square test.