Table 2.
Demographic characteristics of the sample.
| Age (years), (Mean ± SD) | 13.39 ± 0.99 |
| Sex, n (%) | |
| Female | 779 (55.1%) |
| Male | 635 (44.9%) |
| Age group (years) | n (%) |
| 12–13 | 788 (55.7%) |
| 14–16 | 626 (44.3%) |
| Type of school | n (%) |
| Public | 1076 (76.1%) |
| Private | 338 (23.9%) |
| School shift | n (%) |
| Morning shift | 1188 (84%) |
| Evening shift | 226 (16%) |
| School grade | n (%) |
| 1st grade | 552 (39%) |
| 2nd grade | 450 (31.8%) |
| 3rd grade | 412 (29.1%) |
| Type of family | n (%) |
| Nuclear family | 763 (54%) |
| Extended family | 353 (25%) |
| Single-parent family | 235 (16.6%) |
| Unipersonal family | 63 (4.5%) |