Highlights • Treatnet Family (TF) had a positive significant impact in reducing alcohol use.• After participating in the TF, the adolescents were engaged with significantly fewer friends who consumed substances… Click to show full abstract
Highlights • Treatnet Family (TF) had a positive significant impact in reducing alcohol use.• After participating in the TF, the adolescents were engaged with significantly fewer friends who consumed substances and participated in antisocial behaviours.• The two most reported life events (i.e., “got in a lot of arguments or fights” and “had problems with drugs or alcohol”) before the intervention were significantly decreased at the follow-up assessment.• Based on parent’s/family member’s reports, there was a significant decrease in mental health problems across time.
               
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