Table 3. Predictors of HIV incidence among young adult people who inject drugs; San Francisco, 2000–14.
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| Variable | Crude HR | 95% CI | Adjusted HR a | 95% CI |
|---|---|---|---|---|
| Age at enrolment, years | 0.97 | 0.81, 1.15 | 0.83 | 0.59, 1.15 |
| Race/ethnicity | ||||
| White | 1 | Referent | 1 | Referent |
| African-American | 26.67 | 3.56, 199.69 | 39.68 | 1.77, 887.27 |
| Hispanic | 40.42 | 7.74, 211.2 | 60.29 | 4.70, 773.17 |
| Other | 2.03 | 0.18, 22.45 | 5.35 | 0.31, 92.80 |
| Sexual behavior | ||||
| Men heterosexual or female | 1 | Referent | 1 | Referent |
| Men who ever had sex with men | 10.25 | 2.16, 48.58 | 9.83 | 1.45, 66.77 |
| Recent needle and syringe program service, past 30 days | ||||
| No | 1 | Referent | 1 | Referent |
| Yes | 0.87 | 0.21, 3.64 | 1.94 | 0.23, 16.31 |
| Recent drug treatment in last 3 months | ||||
| No | 1 | Referent | 1 | Referent |
| Yes | 0.32 | 0.04, 2.61 | 1.34 | 0.10, 18.01 |
| Ever incarcerated (prison, jail or juvenile hall) | ||||
| No | 1 | Referent | 1 | Referent |
| Yes | 0.58 | 0.07, 4.97 | 0.36 | 0.03, 4.72 |
Abbreviations: HR, hazard ratio; CI, confidence interval;
a Includes all variables with significant Log-rank test in Table 2 at the level of 0.05, and needle exchange, drug treatment and incarceration as already known confounders for HIV incidence.