Fig. 3.

Schedule of enrolment, assessment and intervention. Note: CP central project, SP3 sub-project 3, ProWISE single-session web-based brief motivational alcohol intervention, PE psychoeducation, TA text-message-initiated assessment, TIP text-message-initiated individualised prompt, CRAFFT-d screen for risky alcohol use (Car, Relax, Alone, Forget, Friends, Trouble), AUDIT Alcohol Use Disorders Identification Test, Adapted AUDIT-C (30d) Alcohol Use Disorders Identification Test - Consumption adapted to assess alcohol use in the past 30 days, RAPI Rutgers Alcohol Problem Index, RTC Algorithm Readiness to change drinking algorithm, DMQ-R SF Drinking Motive Questionnaire-Revised Short Form, AHSQ Actual Help-Seeking Questionnaire, SDQ Strengths and Difficulties Questionnaire, KIDSCREEN-10 Quality of life measure for children and adolescents, CAST Cannabis Abuse Screening Test, SCL-9-K Short version of the Symptom Checklist, SCS-K-D German short form of the Self-Control Scale, AIC Adolescent Injury Checklist