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The results of subgroup analysis
| Items | Prevalence 95% CI | I2 (%) | P |
|---|---|---|---|
| Quality of studies | |||
| High | 13% (10–15) | – | – |
| Intermediate | 28% (16–40) | 99.1 | 0.00 |
| Low | 30% (20–40) | 99.2 | 0.00 |
| Sample size | |||
| ≤ 400 | 29% (16–43) | 98.6 | 0.00 |
| > 400 | 27% (18–37) | 99.5 | 0.00 |
| Prisoner type | |||
| Prisoners who inject drugs | 53% (42–64) | 94.6 | 0.00 |
| Prisoners who make use of drugs | 25% (11–38) | 97.5 | 0.00 |
| General (non-risk) | 19% (10–29) | 99.5 | 0.00 |
