This non-randomized cluster-controlled trial examines the effectiveness of the digitalized and updated version of the It´s Up To You - program, a universal school-based prevention intervention for drug initiation and use targeting youth aged between 12 and 17 years.
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Substance use: Alcohol
Timeframe: Past 30-day period
Substance use: Tobacco
Timeframe: Past 30-day period
Substance use: Cannabis
Timeframe: Past 30-day period