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| Outcome or subgroup title | No. of studies | No. of participants | Statistical method | Effect size |
|---|---|---|---|---|
| 1 abstinence at follow up | 1 | 38 | Risk Ratio (M‐H, Fixed, 95% CI) | 1.63 [0.62, 4.26] |
| 2 reincarceration | 1 | 38 | Risk Ratio (M‐H, Fixed, 95% CI) | 0.65 [0.26, 1.65] |
