Table 1.
Characteristics of the intervention and control groups by age, sex and academic year: frequency and (percentage).
| Variables | Intervention Group (n = 120) |
Control Group (n = 45) |
|---|---|---|
| Age M (SD) | 12.18 (0.81) | 11.93 (1.07) |
| Sex | ||
| Boys | 43 (26.1%) | 20 (12.1%) |
| Girls | 77 (46.7%) | 25 (15.2%) |
| Academic year | ||
| Sixth grade of primary education | 26 (15.8%) | 20 (12.1%) |
| First grade of compulsory secondary education (CSE) | 53 (32.1%) | 12 (7.3%) |
| Second grade of compulsory secondary education (CSE) | 41 (24.8%) | 13 (7.9%) |
Age (M = arithmetic mean; SD = standard deviation); age, sex and academic year.