D'Amico 2013.

Methods	Design: RCT Follow‐up: 3 months Attrition: 3%
Participants	Mean age (years): 16.6 mean age at baseline Sex: 67% male N participants: 193 Allocation: n = 113 intervention; n = 80 control Setting: teen court referrals (for alcohol or marijuana offence); higher risk Country: USA
Interventions	Programme type: motivational interviewing Set‐up: group based; 6 sessions Key components: group motivational interviewing; all sessions delivered using an MI approach Duration: each session 50‐55 min Control: usual care: 6 sessions of abstinence‐oriented AA approach
Outcomes	Outcomes: frequency of drinking, binge drinking and alcohol‐related consequences Measures: from RAND adolescent panel study; consequences from questions based on DSM‐IV criteria
Funding and Declared Conflicts of Interest	Funded by NIDA. No information or declarations about potential conflicts of interest
Notes	—
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	No information
Allocation concealment (selection bias)	Unclear risk	No information
Incomplete outcome data (attrition bias) All outcomes	Low risk	Low attrition (3%)
Selective reporting (reporting bias)	Low risk	All outcomes reported
Blinding of participants and personnel (performance bias) All outcomes	High risk	Not possible to blind participants to intervention. Insufficient information to make a judgement about blinding of therapists
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	No information
Unit of Analysis issues	Low risk	Not applicable