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Number of participating classes and participants by school
| Number | School 1 | School 2 | School 3 | School 4 | School 5 | School 6 | School 7 |
|---|---|---|---|---|---|---|---|
| Control classes (N) | 0 | 0 | 0 | 2 | 6 | 3 | 0 |
| Experimental classes (N) | 5 | 1 | 3 | 4 | 1 | 3 | 2 |
| Total classes (N) | 5 | 1 | 3 | 6 | 7 | 6 | 2 |
| Control participants (n) | 0 | 0 | 0 | 16 | 58 | 23 | 0 |
| Experimental participants (n) | 74 | 24 | 59 | 31 | 18 | 37 | 22 |
| Total participants (n) | 74 | 24 | 59 | 47 | 76 | 60 | 22 |
N Number of classes, n number of participants
