Table 1 Sample descriptive statistics
Variable | Category | Frequency | Percent |
|---|---|---|---|
Gender | Male | 684 | 46.9 |
Female | 775 | 53.1 | |
Grade | 7th | 241 | 16.5 |
8th | 216 | 14.8 | |
9th | 218 | 14.9 | |
10th | 260 | 17.8 | |
11th | 285 | 19.5 | |
12th | 239 | 16.4 | |
Ethnicity | Han ethnicity | 1443 | 98.9 |
Ethnic minorities | 16 | 1.1 | |
Province | Beijing | 218 | 14.9 |
Zhejiang | 104 | 7.1 | |
Guangdong | 98 | 6.7 | |
Henan | 172 | 11.8 | |
Jiangxu | 580 | 39.8 | |
Shanxi | 105 | 7.2 | |
Sichuan | 182 | 12.5 |