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| Outcome or subgroup title | No. of studies | No. of participants | Statistical method | Effect size |
|---|---|---|---|---|
| 1 Extent of substance use | 7 | Std. Mean Difference (Random, 95% CI) | Subtotals only | |
| 1.1 Short f‐u | 7 | 986 | Std. Mean Difference (Random, 95% CI) | 0.12 [‐0.01, 0.24] |
| 1.2 Medium f‐u | 2 | 265 | Std. Mean Difference (Random, 95% CI) | 0.38 [0.10, 0.66] |
