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| Total participants | Males | Females | |
| (n. 686) | (n. 288) | (n. 398) | |
| Age (years; mean ± SD) | 17.89±0.91 | 17.93±0,92 | 17.86±0.90 |
| Classic or Scientific High School (%) | 71 | 69.8 | 71.9 |
| Other types of High School (%) | 29 | 30.2 | 28.1 |
