Comparison 6. Medium‐dose buprenorphine versus placebo.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Retention in treatment	4	887	Risk Ratio (M‐H, Random, 95% CI)	1.74 [1.06, 2.87]
2 Morphine‐positive urines	2	463	Std. Mean Difference (IV, Random, 95% CI)	‐0.08 [‐0.78, 0.62]
3 Cocaine‐positive urines	1		Std. Mean Difference (IV, Random, 95% CI)	Totals not selected
4 Benzodiazepine‐positive urines	1		Std. Mean Difference (IV, Random, 95% CI)	Totals not selected