Feldstein 2007.

Methods	RCT.
Participants	55 US under aged heavy drinkers.
Interventions	1 session MI (n= 40) vs no treatment control (n= 15).
Outcomes	Physiological primary: None. Non‐physiological primary: Binge drinking last 2 weeks, RAPI. Secondary: None.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Used a random number list.
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	Low risk	"Undergraduate assistants blind to the randomization collected participant data at the follow‐up."
Incomplete outcome data (attrition bias) All outcomes	Low risk	7% lost‐to‐follow‐up at 2 months, balanced across groups. Reasons stated. Not ITT.
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. Differences between groups at baseline were not reported.