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Broad outcomes reported across included studies.
| Age group/outcome | Children/younger people's outcomes | Older people's outcomes | Other people's outcomes (e.g., carers) | Mutual outcomes | Economic outcomes | Process outcomes | Adverse outcomes |
|---|---|---|---|---|---|---|---|
| 0–5 | 71 | 94 | 17 | 16 | 3 | 47 | 19 |
| 6–12 | 137 | 115 | 18 | 26 | 1 | 65 | 15 |
| 12–18 | 103 | 99 | 12 | 26 | 0 | 55 | 9 |
| 19–30 | 129 | 89 | 10 | 12 | 0 | 56 | 11 |
| Not described | 25 | 35 | 1 | 10 | 0 | 20 | 8 |
