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Basic characteristics of respondents (n=664)
| Characteristics | Number | % |
| Gender | ||
| Male | 228 | 34.3 |
| Female | 436 | 65.7 |
| Age | ||
| ≤25 years old | 312 | 47.0 |
| >25 years old | 352 | 53.0 |
| Residence | ||
| Urban | 429 | 64.6 |
| Rural | 235 | 35.4 |
| Grade | ||
| 1 | 205 | 30.9 |
| 2 | 266 | 40.0 |
| 3 | 193 | 29.1 |
| Marital status | ||
| Married | 34 | 5.1 |
| Unmarried | 630 | 94.9 |
| Monthly income (¥) | ||
| ≤1000 | 156 | 23.5 |
| 1001–2000 | 494 | 74.4 |
| 2001–3000 | 14 | 2.1 |
| Region | ||
| Eastern China | 425 | 64.0 |
| Central China | 154 | 23.2 |
| Western China | 85 | 12.8 |
