Unadjusted and adjusted Cox proportional hazard analysis of time to hepatitis C infection among 512 drug-using youth: At-Risk Youth Study (ARYS), Vancouver, British Columbia, 2005–2011
| Characteristic | Adjusted HR (95% CI) | |||
|---|---|---|---|---|
| Unadjusted HR (95% CI) | Model 1* | Model 2† | Model 3‡ | |
| Male gender | 0.48 (0.28 to 0.81) | 0.50 (0.28 to 0.90) | 0.42 (0.24 to 0.75) | 0.50 (0.28 to 0.90) |
| Age (per year older) | 0.96 (0.87 to 1.06) | 1.10 (0.91 to 1.10) | 1.00 (0.91 to 1.11) | 1.00 (0.91 to 1.10) |
| Prescription opioid injection | 3.48 (1.57 to 7.70) | – | 2.02 (0.89 to 4.61) | 0.94 (0.40 to 2.21) |
| Heroin injection | 9.89 (5.72 to 17.1) | 4.49 (2.42 to 8.33) | – | 4.56 (2.39 to 8.70) |
| Cocaine injection | 5.69 (3.18 to 10.2) | 1.87 (1.00 to 3.47) | 2.20 (1.14 to 4.23) | 1.88 (1.00 to 3.54) |
| Crystal methamphetamine injection | 7.39 (4.36 to 12.5) | 2.94 (1.62 to 5.34) | 5.11 (2.79 to 9.34) | 2.91 (1.57 to 5.38) |
| Syringe sharing | 7.69 (3.93 to 15.0) | 2.47 (1.20 to 5.09) | 2.57 (1.24 to 5.32) | 2.47 (1.20 to 5.10) |
*Model 1 includes all covariates listed except prescription opioid injection.
†Model 2 includes all covariates listed except heroin injection.
‡Model 3 includes all covariates listed.