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Number of included studies by health topic
| Health topic | Number of studies |
|---|---|
| HIV/AIDS/HCV/BBV prevention | 20 |
| General health, hygiene | 12 |
| Emotional support | 8 |
| Suicide/self harm prevention | 7 |
| Employment/housing post release | 4 |
| Mental health/substance abuse | 2 |
| Improving educational skills | 2 |
| Parenting | 1 |
| Violence reduction | 1 |
