This study corresponds to a pretest-posttest randomized experimental design with two arms. Arm 1 includes Guided Self-Change program, and Arm 2 a psychoeducational program to promote healthy habits. This study aims to analyze the efficacy of a selective and indicated prevention program based on the Guided Self-Change model (GSC) in adolescent alcohol users between 16-18 years. Researchers hypothesize that implementation of GSC therapy will lead to a greater reduction of alcohol drinkers compare with the control condition, and will prevent alcohol abuse after 6 and 12 months.
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Alcohol use change
Timeframe: Change from baseline up to 5 weeks and two follow-ups at 6 and 12 months post intervention
Alcohol abuse
Timeframe: Change from baseline to week 5, and at 6 and 12 months post intervention.
Alcohol dependence
Timeframe: Change from baseline to week 5, and at 6 and 12 months post intervention.