|  | Country |  |
---|---|---|---|
 | Austria | Norway | Spain |
Sample size | 991 | 1142 | 1297 |
No (%) of boys | 500 (50.5) | 568 (49.7) | 694 (53.5) |
Mean age (SD) | 11.4 (.41) | 11.3 (.29) | 11.4 (.42) |
Age range | 10.8–12.8 | 10.8–12.3 | 10.8–12.8 |
Number of classes/schools* | 73 classes/23 schools | 73 classes/52 schools | 64 classes/37 schools |
Response rate* | 95.3% | 89.5% | 94.7% |