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Age and gender distribution of the subject group
| Age (years) | Number (n) (%) | Percentage (%) | |
|---|---|---|---|
| Female | Male | ||
| 7 | 5 (3.73) | 10 (7.46) | 11.2 |
| 8 | 17 (12.69) | 18 (13.43) | 26.1 |
| 9 | 14 (10.45) | 14 (10.45) | 20.9 |
| 10 | 6 (4.48) | 12 (8.96) | 13.4 |
| 11 | 8 (5.97) | 13 (9.70) | 15.7 |
| 12 | 2 (1.49) | 7 (5.22) | 6.7 |
| 13 | 2 (1.49) | 3 (2.24) | 3.7 |
| 14 | 0 (0) | 3 (2.24) | 2.2 |
