Table 1. Demographic and clinical characteristics of the study population (n = 1763).
| Age (years) | 44 (19–76) |
| Women (%/n) | 52.0/917 |
| College graduation (%) | 36.2/639 |
| Household income (x10,000 KRW/month) | 379 ± 7 |
| Alcohol intake 3 30 g/day (%) | 13.8/244 |
| Current smoking (%/n) | 24.3/428 |
| Diabetes (%/n) | 10.0/177 |
| Hypertension (%/n) | 21.9/386 |
| Self-reported coronary heart disease history (%/n) | 1.1/19 |
| Self-reported cerebrovascular disease history (%/n) | 1.0/18 |
| Self-reported cancer history (%/n) | 3.3/58 |
| fT4 (ng/dL) | 1.24 (0.89–1.76) |
| TSH (mIU/mL) | 2.23 (0.01–29.50) |
| Subclinical hypothyroidism (%/n) | 3.3/59 |
| Subclinical hyperthyroidism (%/n) | 2.6/46 |
| PHQ9 score | 2 (0–27) |
| Level of depression severity,PHQ9 score (%/n) | |
| Minimal, 0- | 78.0/1376 |
| Mild, 5–9 | 15.8/279 |
| Moderate, 10–14 | 4.7/83 |
| Moderately severe, 15–19 | 1.1/19 |
| Severe, 20–27 | 0.3/6 |
Data are expressed as mean ± SE or median (range).