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Descriptive statistics (N = 2510)
| Variables | Mean ± SD / n (%) |
|---|---|
| Age | 14.2 ± 0.9 |
| Gender | |
| Male | 1281 (51.04) |
| Female | 1229 (48.96) |
| Grade | |
| 4 ~ 6 | 84 (3.35) |
| 7 ~ 9 | 2426 (96.65) |
| Nationality | |
| Han | 2487 (99.08) |
| Minorities | 23 (0.92) |
| COVID-19 infection history | |
| Yes | 84 (3.35) |
| No | 2426 (96.65) |
