Distribution of baseline neurocognitive testing
| Number of students tested | Frequency (number of schools) | Per cent | Average EDR ±SD |
| None of the students | 25 | 18% | 24.8±14.4 |
| All students engaged in certain extracurriculars at the school | 20 | 14% | 20.9±16.1 |
| All students engaged in any extracurriculars at the school | 77 | 55% | 19±10.3 |
| All students in certain grades | 13 | 9% | 12.73±6.2 |
| All students in the school | 5 | 4% | 20.9±19.1 |