Table 1 The characteristics of the study participants
| Â | 2020 | 2021 | ||
|---|---|---|---|---|
N | % | N | % | |
Age | ||||
 20–29 | 80 | 9.7 | 67 | 8.1 |
 30–39 | 110 | 13.3 | 109 | 13.2 |
 40–49 | 140 | 17.0 | 126 | 15.3 |
 50–59 | 178 | 21.6 | 187 | 22.6 |
 60–69 | 151 | 18.3 | 146 | 17.7 |
 70- | 167 | 20.2 | 191 | 23.1 |
Mean (SD) | 53.4 | 16.0 | 54.6 | 16.0 |
Gender | ||||
 Male | 401 | 48.6 | 401 | 48.6 |
 Female | 425 | 51.5 | 425 | 51.5 |
Educational attainment | ||||
 Junior high school | 30 | 3.6 | 30 | 3.6 |
 High school/Vocational school | 348 | 42.1 | 348 | 42.1 |
 2-year college | 115 | 13.9 | 115 | 13.9 |
 University or higher | 333 | 40.3 | 333 | 40.3 |
Self-assessed economic status | ||||
 Low:1–3 | 139 | 16.8 | 139 | 16.8 |
 Middle low: 4–5 | 354 | 42.9 | 337 | 40.8 |
 Middle high: 6–7 | 292 | 35.4 | 301 | 36.4 |
 High: 8–10 | 39 | 4.7 | 45 | 5.5 |
 missing | 2 | 0.2 | 4 | 0.5 |
Work status | ||||
 Self-employed | 78 | 9.4 | 84 | 10.2 |
 Full-time employed | 320 | 38.7 | 305 | 36.9 |
 Part-time employed | 148 | 17.9 | 154 | 18.6 |
 Others | 278 | 33.7 | 281 | 34.1 |
 missing | 2 | 0.2 | 2 | 0.2 |
Presence of a currently treated disease | ||||
 Yes | 358 | 43.3 | 358 | 43.3 |
 No | 442 | 53.5 | 456 | 55.2 |
 missing | 26 | 3.2 | 12 | 1.5 |