Cimini 2009.

Methods	Design: RCT Follow‐up: 6 months Attrition: 31%
Participants	Mean age (years): not stated; college students Sex: 62.2% male N participants: 685 Allocation: not reported Setting: college campus with students mandated for alcohol violation Country: USA
Interventions	Programme type: motivational interviewing Set‐up: group single session Key components: discussion focused on evaluation of alcohol consumption and associated problems Duration: 2 h Control: alternative intervention
Outcomes	Outcomes: peak number of drinks on 1 occasion; average number of drinks per week; alcohol problems Protective behavioural strategies (possible mediator)  Measures: Daily Drinking Questionnaire; Rutgers Alcohol Problem Index; Protective Behaviors Strategies Scale
Funding and Declared Conflicts of Interest	Funded by NIAAA. No information or declarations about potential conflicts of interest
Notes	No significant effects of intervention found, but insufficient information to include in meta‐analysis. Authors contacted for further information on group size, means and standard deviations for all outcomes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Insufficient information about the sequence generation process to permit judgement
Allocation concealment (selection bias)	Unclear risk	Insufficient information to make a judgement
Incomplete outcome data (attrition bias) All outcomes	High risk	31% attrition
Selective reporting (reporting bias)	Low risk	All expected outcomes were 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	Insufficient information to make a judgement
Unit of Analysis issues	Low risk	Not applicable