Segatto 2010.

Methods	Design: RCT Follow‐up: 3 months  Attrition: 15%
Participants	Mean age (years): 21.8 Sex: 90.3% male N participants: 175 Allocation: n = 87 intervention n = 88 control Setting: emergency room; higher risk patients Country: Brazil
Interventions	Programme type: brief motivational interviewing Set‐up: single individual session Key components: roll with resistance, express empathy, avoid argumentation, develop discrepancy and support self efficacy Duration: 45 min Control: assessment only
Outcomes	Outcomes: pattern of alcohol consumption over the previous 3 months, considering the number of abstinent days, and amount of alcohol consumed; alcohol‐related problems; traffic violations, police involvement, physical health and sexuality; perception of future risks associated with excessive alcohol ingestion considering that the pattern of alcohol abuse does not change within 3 months; motivational stage to change behaviour Measures: Alcohol Consumption Questionnaire; Rutgers Alcohol Problem Index; Alcohol Consumption Risk Questionnaire; Alcohol Perception of Risk Assessment; Readiness to Change Questionnaire
Funding and Declared Conflicts of Interest	No information
Notes	—
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	A lottery system was employed
Allocation concealment (selection bias)	Low risk	Lottery system performed by ER personnel not linked to the clinical trial in order to avoid selection bias
Incomplete outcome data (attrition bias) All outcomes	Low risk	Attrition 15%
Selective reporting (reporting bias)	Unclear risk	All outcomes reported
Blinding of participants and personnel (performance bias) All outcomes	High risk	"Patients were blinded to the intervention applied" (Procedures section). Personnel not blinded
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Instruments were applied by an independent researcher
Unit of Analysis issues	Low risk	Not applicable