Table 1 Descriptive statistics of children and adolescents in the present study
| Â | Total sample | Girls | Boys |
|---|---|---|---|
Gender (n, %) | |||
 Female | 828 (55.1) |  |  |
 Male | 676 (44.9) |  |  |
Age group (n, %) | |||
 Pre-adolescent (11–12 years) | 482 (32.0) | 248 (30.2) | 231 (34.5) |
 Early-adolescent (13–14 years) | 495 (32.9) | 277 (33.7) | 214 (32.0) |
 Adolescent (15–17 years) | 527 (35.0) | 297 (36.1) | 224 (32.5) |
School form (n, %) | |||
 High | 597 (39.9) | 383 (46.9) | 209 (31.2) |
 Medium | 750 (50.2) | 377 (46.1) | 367 (54.9) |
 Low | 151 (10.1) | 57 (7.0) | 93 (13.9) |
Age (M, SD) | |||
| Â | 13.6 (1.8) | 13.7 (1.7) | 13.6 (1.8) |