Comparison 3. Contingency management + standard maintenance versus standard maintenance alone.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
3.1 Social functioning: mean family/social domain scores (high = poor); ASI; at 6 months	1		Mean Difference (IV, Fixed, 95% CI)	Totals not selected
3.2 Leaving the study early	2	127	Odds Ratio (M‐H, Fixed, 95% CI)	0.59 [0.28, 1.24]
3.3 Substance misuse (drugs): numbers with cocaine‐negative specimens; at 17 weeks	1		Odds Ratio (M‐H, Fixed, 95% CI)	Totals not selected
3.4 Substance misuse (drugs): numbers with cocaine‐negative specimens; at 26 weeks	1		Odds Ratio (M‐H, Fixed, 95% CI)	Totals not selected
3.5 Substance misuse (drugs): numbers with cocaine‐negative specimens; at 52 weeks	1		Odds Ratio (M‐H, Fixed, 95% CI)	Totals not selected
3.6 Other: proportion transferred to routine care due to poor treatment response (high = poor); by 6 months	1		Odds Ratio (M‐H, Fixed, 95% CI)	Totals not selected