Study design
RECRUITMENT
The main aim, method, design and recruitment strategy in the ScIMs project have been presented elsewhere [Participating in the class-scheduled physical activity was mandatory for all pupils attending the intervention schools. The control schools received intervention material and funding the year after the data collection period was over. With respect to the data collection, an informed consent form was signed by parents, and the pupils could withdraw from data collection at any time. The ScIM project received approval from the Norwegian Centre for Research Data.The ScIM project was commissioned and funded by the Norwegian Directorate for Education and Training (UDIR), although UDIR was not involved in its execution, data collection, analysis, or interpretation of findings.