Wood 2007.

Methods	RCT (2x2 factorial design).
Participants	335 US heavy drinking college students.
Interventions	1. Brief MI (BMI) (n= 84) 2. Alcohol Expectancy Challenge (AEC) (n= 87) 3. BMI and AEC (n= 81) assessment only (n= 83). AEC involved 2 sessions with a group discussion about alcohol expectancies in a simulated bar environment.
Outcomes	Physiological primary: None. Non‐physiological primary: Number of drinks per week, number of heavy drinking episodes in the past 30 days. Hangovers, blackouts, increased subjective tolerance. Secondary: None.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	"...randomized, separately by gender."
Allocation concealment (selection bias)	Unclear risk	Insufficient information to permit judgment.
Blinding (performance bias and detection bias) Patients and providers	High risk	No blinding.
Blinding (performance bias and detection bias) Assessors	Unclear risk	It is not stated whether the assessors were blinded.
Incomplete outcome data (attrition bias) All outcomes	High risk	"Cumulative participant attrition was 18%, 25%, and 28% at 1‐, 3‐, and 6 month follow‐ups, respectively. Not balanced. 21 in the AEC group and 24 in the BMI‐AEC group were dropped by design because it was not possible to schedule them for at least one of two group AEC sessions. ITT was not performed.
Selective reporting (reporting bias)	Low risk	The published report included all expected outcomes based on the study hypotheses.
Other bias	Unclear risk	Only self‐reported outcomes. There were no differences between groups at baseline.