Comparison 4. MIB vs. control: maternal outcomes.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Positive urine drug test (end of treatment)	2	278	Risk Ratio (M‐H, Random, 95% CI)	0.96 [0.63, 1.48]
2 Positive urine drug test at three months (follow‐up)	1	159	Risk Ratio (M‐H, Random, 95% CI)	1.13 [0.55, 2.31]
3 Positive urine at delivery	1	128	Risk Ratio (M‐H, Random, 95% CI)	0.84 [0.57, 1.24]
4 Retention at treatment completion	3	355	Risk Ratio (M‐H, Random, 95% CI)	0.97 [0.89, 1.06]
5 Short term treatment retention	3	334	Risk Ratio (M‐H, Random, 95% CI)	0.99 [0.88, 1.12]