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Demographic characteristics of participants (N=120).
| Characteristic | n (%) | |
| Age (years) | ||
| 25≤years<40 | 1 (4) | |
| 40≤years<50 | 3 (11) | |
| 50≤years<60 | 6 (21) | |
| 60≤years<70 | 9 (32) | |
| years≥70 | 9 (32) | |
| Gender | ||
| Male | 17 (61) | |
| Female | 11 (39) | |
| Education | ||
| No education | 1 (4) | |
| Elementary school | 6 (21) | |
| Junior high school | 4 (14) | |
| High school | 11 (39) | |
| College | 5 (18) | |
| Graduate | 1 (4) | |
| Occupation (n=120) | ||
| Unemployed | 8 (7) | |
| Public servant | 5 (4) | |
| Office worker | 21 (18) | |
| Businessman | 17 (14) | |
| Retired | 64 (53) | |
| Others | 5 (4) | |
