GIBSON1999: Study 1.

Methods	Random assignment of individuals
Participants	220 participants who had just completed opioid detoxification in USA Age range: 20‐49 Sex: 204 males, 91 females
Interventions	1. Standard education: 1 session (50 mins) of education and problem solving 2. Self help booklet
Outcomes	Injection risk behaviour Sexual risk behaviour
Notes	no blinding HIV testing
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	D ‐ Not used