|  | n | % |
---|---|---|---|
Gender | Male | 248 | 85.5 |
 | Female | 42 | 14.5 |
Age | 1-3 | 93 | 32.1 |
 | 4-6 | 133 | 45.9 |
 | 7-9 | 50 | 17.2 |
 | ≥ 10 | 14 | 4.8 |
Race/ethnicity | Han Chinese | 279 | 96.2 |
 | Minority Chinese | 11 | 3.8 |
Number of children | Single child | 255 | 87.9 |
 | Non-single child | 35 | 12.1 |
Family structure | Nuclear family | 208 | 71.7 |
 | Non-nuclear family | 82 | 28.3 |
Address | Harbin | 99 | 34.1 |
 | Other cities | 191 | 65.9 |
Urban/Rural areas | Urban | 209 | 72.1 |
 | Rural | 81 | 27.9 |
Mother's education level | Elementary school | 27 | 9.3 |
 | Junior high school | 97 | 33.4 |
 | High school or technical school | 68 | 23.4 |
 | Vocational college or bachelor's degree | 94 | 32.4 |
 | Masters degree | 4 | 1.4 |
Father's education level | Elementary school | 17 | 5.9 |
 | Junior high school | 106 | 36.6 |
 | High school or technical school | 75 | 25.8 |
 | Vocational college or bachelor's degree | 85 | 29.3 |
 | Masters degree | 7 | 2.4 |