Table 1.
Demographic characteristics of students in Chongqing (N = 18,865).
| Variables | n | % | |
|---|---|---|---|
| Year (mean, SD) | 14.28, 1.75 | ||
| Gender | Boy | 9,359 | 50.16 |
| Girl | 9,301 | 49.84 | |
| Ethnicity | Han | 16,581 | 88.86 |
| Minority | 20,79 | 11.14 | |
| Grade | Junior high school | 10,670 | 57.18 |
| Senior high school | 7,990 | 42.82 | |
| Whether boarding in school | Yes | 12,183 | 65.29 |
| No | 6,477 | 34.71 | |
| Residence | Urban | 9,062 | 48.56 |
| Rural | 9,598 | 51.44 | |
| Whether receiving school meal support from the government | Yes | 9,159 | 49.08 |
| No | 9,501 | 50.92 | |
| Primary caregiver | Parents | 13,313 | 71.35 |
| Others | 5,347 | 28.65 | |
| Father's education | Primary schools and below | 4,176 | 22.38 |
| Junior high school | 9,539 | 51.12 | |
| Senior high school/technical secondary school/vocational high school | 3,264 | 17.49 | |
| College/bachelor degree or above | 1,681 | 9.01 | |
| Mother's education | Primary schools and below | 8,555 | 45.85 |
| Junior high school | 8,638 | 45.79 | |
| Senior high school/technical secondary school/vocational high school | 2,865 | 15.35 | |
| College/bachelor degree or above | 1,388 | 7.44 | |
| BMI (Kg/m2) (mean, SD) | 22.38 (1.75) | ||
| BMI group | Normal | 10,579 | 56.69 |
| Thin | 2,986 | 16.00 | |
| Overweight | 1,747 | 9.36 | |
| Obese | 3,348 | 17.94 | |