Demographic characteristics of the respondents (N=7908)
| Characteristics | N (%) |
| Gender | |
| Male | 6069 (76.7) |
| Female | 1839 (23.3) |
| Age | |
| 18–25 | 957 (12.1) |
| 26–35 | 2851 (36.1) |
| 36–45 | 2897 (36.6) |
| >46 | 1203 (15.2) |
| Education level | |
| Middle school or below | 1340 (16.9) |
| High school | 4478 (56.6) |
| College/university or above | 2090 (26.4) |
| BMI (kg/m2) | |
| <18.5 | 445 (5.6) |
| 18.5–23.9 | 5028 (63.6) |
| 24–27.9 | 2095 (26.5) |
| >28 | 340 (4.3) |
| Job experience (years) | |
| <5 | 1917 (24.2) |
| 5–9 | 1577 (19.9) |
| 10–14 | 1593 (20.1) |
| >15 | 2821 (35.7) |
BMI, body mass index.