Naar‐King 2007.

Methods	RCT.
Participants	65 youth (ages 16‐25 years) living with HIV. USA.
Interventions	MET(n= 32) vs wait list (n= 33).
Outcomes	Physiological primary: None. Non‐physiological primary: Number of standard drinks in one week and number of times used marijuana in one week (via Timeline Follow‐Back). Secondary: None. Follow‐ups were at baseline, 3, and 6 months.
Notes	The intervention is known as "Healthy Choices".
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	"Random numbers were generated by the project manager using an Internet based random number generator and were placed in sealed envelopes."
Allocation concealment (selection bias)	Low risk	"The data collector received sealed envelopes revealing randomisation status, which were opened after the baseline assessment so that the intervention sessions could be scheduled immediately for the treatment group."
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 assessors were blinded.
Incomplete outcome data (attrition bias) All outcomes	Low risk	Attrition at 6 months was 23% for the whole sample. No reasons stated. Balanced. ITT conducted.
Selective reporting (reporting bias)	Low risk	The published report included all expected outcomes based on the stated hypotheses.
Other bias	Unclear risk	Only self‐reported outcomes. Differences between groups at baseline were not reported.