| Variables | Number (n) | Percentage (%) |
| Gender |
|
|
| Male | 116 | 41 |
| Female | 166 | 59 |
| Total | 282 | 100 |
| Socio-economic level |
|
|
| Low level (public school) | 146 | 51.77 |
| High level (private school) | 136 | 48.23 |
| Age |
|
|
| Average age: 13, 11 years |
|
|
| 10 - 12 years | 91 | 32.3 |
| 13 - 15 years | 191 | 67.7 |