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Baseline measurement: Distribution of pupils of which data at all three levels are available (IG: intervention group, CG: control group)
| grade | group | n (%) | % of boys |
|---|---|---|---|
| 1 | IG | 411 (53.4%) | 50.1% |
| CG | 358 (46.6%) | 50.6% | |
| 2 | IG | 382 (55.5%) | 45.6% |
| CG | 306 (44.5%) | 50.3% | |
| mixed-grade classes (1/2) | IG | 123 (57.7%) | 58.5% |
| CG | 90 (42.3%) | 58.9% | |
