Study	Reason for exclusion
Boatler 1994	pre‐post analysis with inadequate controls
Booth 1996	aim of intervention not focused on HIV risk prevention
Booth 2004	no extractable data
CDC 1999	intervention conducted at the community level
Choopanya 2003	pre‐post analysis with inadequate controls
Compton 1998	not relevant comparison
Compton 2000	not relevant comparison
Conrad 1998	primarily addressing alcohol misuse
El‐Bassel 2005	no adequate controls
Epstein2003	not primarily aimed at reducing HIV risk behaviours
Heil 2005	no behavioural outcomes
Hershberger 2003	not RCT
Kwiatkowski 1999	not analysed by original groups
Latkin 1996	structural interventions
Latkin 2003	structural interventions
Linderberg 2002	not primarily addressing people who misuse drugs
Malow 1992	did not directly assess behavioural outcomes
Martin 2001	did not assess required behavioural outcomes
McCoy 1996	no extractable data
McCusker 1992	no extractable data
Rhodes 1994	no clear information on group assignment
Sherman 2006	no control group
Simpson 1994	no extractable data for intervention vs control
St Lawrence 1997	no behavioural outcomes
Sterk 2003	no extractable data