Table 1 Study sample characteristics (N = 2,080)
| Â | Number | % |
|---|---|---|
Gender | Â | Â |
 Male | 1227 | 59.0 |
 Female | 853 | 41.0 |
Age | Â | Â |
 18–30 | 441 | 21.2 |
 31–40 | 849 | 40.8 |
 41–50 | 609 | 29.3 |
 51–68 | 181 | 8.7 |
Education | Â | Â |
 Graduate | 47 | 2.3 |
 Bachelor | 938 | 45.1 |
 No degree | 1095 | 52.6 |
Exposure degree | Â | Â |
 High | 392 | 18.9 |
 Moderate | 766 | 36.8 |
 Low | 922 | 44.3 |
Ethnic | Â | Â |
 Han | 1674 | 80.5 |
 Tibetan | 147 | 7.1 |
 Qiang | 211 | 10.1 |
 Hui | 37 | 1.8 |
 Other | 11 | 0.5 |
Income | Â | Â |
 <1,000 | 385 | 18.5 |
 1,000-2,000 | 1360 | 65.4 |
 2,000-3,000 | 264 | 12.7 |
 >3,000 | 71 | 3.4 |
Housing | Â | Â |
 Original house | 758 | 36.4 |
 Public dormitory | 295 | 14.2 |
 Rented house | 643 | 30.9 |
 Temporary settlement | 384 | 18.5 |