| Data item | Description | N (%) / (M ± SD) |
|---|
| Age | | 15 ± 1.6 (years) |
| Gender | male | 914 (49.3%) |
| female | 911 (49.1%) |
| missing data | 29 (1.6%) |
| Single child | yes | 681 (36.7%) |
| no | 1058 (57.1%) |
| missing data | 115 (6.2%) |
| Academic performance | excellent | 271 (14.6%) |
| good | 529 (28.5%) |
| average | 815 (44.0%) |
| bad | 208 (11.2%) |
| missing data | 31 (1.7%) |
| Academic stress | low | 111 (6.0%) |
| average | 1098 (59.2%) |
| high | 638 (34.4%) |
| missing data | 7 (0.4%) |
| missing data | 10 (0.5%) |
| Physical exercise | yes | 1670 (90.1%) |
| no | 180 (9.7%) |
| missing data | 4 (0.2%) |
| Internet addiction | yes | 847 (45.7%) |
| no | 1007 (54.3%) |
| missing data | 0 |
| Cyber victimization | yes | 160 (8.6%) |
| no | 1694 (91.4%) |
| missing data | 0 |
- M: Mean, SD: Standard deviation
