COLON1993.

Methods	Quasi‐randomised assignment of individuals (based on day of admission)
Participants	1866 participants from 4 communities in Puerto Rico Mean Age: 33 years Sex: 1478 males, 378 females
Interventions	1. Psychoeducation: 3 sessions including street outreach and behavioural skills training 2. Control
Outcomes	Injection risk behaviour Sexual risk behaviour
Notes	no blinding received HIV testing
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	D ‐ Not used