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| Variable | Category | PR (95%CI) | APR (95%CI) | p value |
|---|
| Age at first injection | ≤ 15 | 1 | 1 | |
| 16–18 | 0.90 (0.46; 1.78) | 0.86 (0.44; 1.69) | 0.658 |
| > 18 | 0.69 (0.40; 1.21) | 0.61 (0.35; 1.07) | 0.084 |
| Duration of injection (years) | < 1 | 1 | 1 | |
| 1–3 | 1.92 (0.57; 6.43) | 1.99 (0.59; 6.70) | 0.265 |
| 4–6 | 1.76 (0.52; 5.89) | 1.81 (0.54; 6.10) | 0.338 |
| 7–9 | 3.34 (1.03; 10.87) | 3.41 (1.04; 11.14) | 0.041 |
| 10+ | 3.06 (1.00; 9.41) | 2.96 (1.00; 9.13) | 0.049 |
| Injection past month, how often | Once/day | 1 | 1 | |
| > 1 per day | 3.20 (0.90; 21.83) | 3.25 (1.01; 22.41) | 0.037 |
| Once/week | 2.71 (1.00; 20.64) | 2.75 (0.93; 21.04) | 0.059 |
| > 1 per week | 2.57 (0.84; 18.87) | 2.65 (0.80; 19.65) | 0.063 |
| Access to clean needle | Yes | 1 | 1 | |
| No | 1.83 (1.54; 11.27) | 1.76 (1.44; 12.74) | 0.006 |
| Flash blood past month* | No | 1 | 1 | |
| Yes | 2.19 (0.57; 8.44) | 2.13 (0.55; 8.13) | 0.269 |
| Ever shared needle | Yes | 1 | 1 | |
| No | 0.94 (0.64; 1.36) | 0.90 (0.63; 1.38) | 0.746 |
| Shared needle past month | No | 1 | 1 | |
| Yes | 1.68 (1.00; 2.94) | 1.72 (1.02; 3.00) | 0.015 |
| Cleaned last time shared | Yes | 1 | 1 | |
| No | 2.27 (1.01; 6.38) | 2.29 (1.00; 6.37) | 0.043 |
| On opioid treatment | Yes | 1 | | |
| No | 0.40 (0.25; 0.64) | 0.39 (0.24; 0.63) | < 0.001 |
| Ever sold sex | Yes | 1 | 1 | |
| No | 0.84 (0.55; 1.29) | 0.83 (0.55 (1.26) | 0.402 |
| Sold sex past month | No | 1 | 1 | |
| Yes | 1.24 (0.80; 1.91) | 1.25 (0.81 (1.93) | 0.303 |
| Condom use last paid sex | Yes | 1 | 1 | |
| No | 1.77 (0.92; 3.43) | 1.87 (1.00; 3.61) | 0.050 |
| Ever beaten past year | Yes | 1 | 1 | |
| No | 1.07 (0.73; 1.59) | 1.02 (0.69; 1.52) | 0.903 |
| Forced sex past year | No | 1 | 1 | |
| Yes | 1.50 (0.81; 2.78) | 1.49 (0.80; 2.76) | 0.200 |
| Ever arrested past year | No | 1 | 1 | |
| Yes | 1.47 (1.02; 2.12) | 1.41 (0.97; 2.05) | 0.064 |
| Comprehensive HIV knowledge | No | 1 | 1 | |
| Yes | 1.07 (0.72; 1.57) | 1.07 (0.73; 1.56) | 0.735 |
| Risk perception | High | 1 | 1 | |
| Moderate | 1.23 (0.72; 2.11) | 1.26 (0.73; 2.15) | 0.396 |
| No or low | 0.97 (0.65; 1.49) | 0.98 (0.65; 1.50) | 0.961 |
