Kinlock 2007.

Methods	Three group randomised controlled trial. Randomisation: after eligibility established subjects were randomly allocated to one of three groups. Randomisation process not described. Follow up for one month.
Participants	Geographic region: USA Study setting: Prison. Participants were inmates due for release in 3‐6 months. n = 211 males mean age =40.3 years 70% African American, 24% Caucasian Eligibility criteria: DSM IV heroin dependence at time of incarceration, suitability for MMT as determined by medical assessment, willingness to enrol in prison MMT and residing in Baltimore on release. Individuals that did not meet dependence criteria were eligible if they had been enrolled in an opiate treatment program the year prior to incarceration.
Interventions	Treatment: Counseling and methadone maintenance in prison with transfer into treatment on release. Target methadone dose 60mg. Control: Counseling in prison with passive referal to treatment upon release
Outcomes	Entry into community MMT Illicit drug use ‐ self report and urinalysis
Notes	A third group received counseling in prison and active referal to MMT on release group. These results have not been included in the analysis.
Risk of bias
Bias	Authors' judgement	Support for judgement
Adequate sequence generation?	Low risk	Block randomisation procedure.
Allocation concealment?	Unclear risk	B‐ Unclear. Not specified.
Incomplete outcome data addressed? All outcomes	Low risk	No missing data. Report ITT
Free of other bias?	Low risk	No differences between group at baseline.