| No. incident cases | Incidence rate per 100 p.y. | 95% CI†| Rate ratio§ | 95% CI††|
---|---|---|---|---|---|
Total sample | 94 | 31.6 | 25.6 - 38.7 | Â | Â |
Age at first HCV test | Â | Â | Â | Â | Â |
   18 - 25 years | 35 | 26.4 | 18.4 - 36.6 | 1.0 |  |
   >25 years | 59 | 35.9 | 27.3 - 46.3 | 1.4 | 0.9 - 2.1 |
Gender | Â | Â | Â | Â | Â |
   Male | 51 | 26.2 | 19.5 - 34.4 | 1.0 |  |
   Female | 43 | 42.0 | 30.4 - 56.5 | 1.6 | 1.1 - 2.4 |
Ethnic background | Â | Â | Â | Â | Â |
   Other | 68 | 29.2 | 22.7 - 37.0 | 1.0 |  |
   ATSI | 26 | 40.4 | 26.4 - 59.2 | 1.4 | 0.9 - 2.2 |
Continuously in prison | Â | Â | Â | Â | Â |
   No | 70 | 37.0 | 28.8 - 46.7 | 1.0 |  |
   Yes | 24 | 22.6 | 14.5 - 33.6 | 0.6 | 0.4 - 1.0 |
Ever had a tattoo | Â | Â | Â | Â | Â |
   No | 17 | 19.3 | 11.2 - 30.8 | 1.0 |  |
   Yes | 76 | 36.5 | 28.7 - 45.6 | 1.9 | 1.1 - 3.3 |
IDU in 3 months prior to imprisonment* | Â | Â | Â | Â | Â |
   No | 36 | 20.9 | 14.6 - 28.9 | 1.0 |  |
   Yes | 58 | 46.6 | 35.4 - 60.2 | 2.2 | 1.5 - 3.4 |
IDU since imprisonment | Â | Â | Â | Â | Â |
   No | 63 | 29.3 | 22.5 - 37.5 | 1.0 |  |
   Yes | 31 | 38.0 | 25.8 - 54.0 | 1.3 | 0.83 - 2.0 |
Duration of IDU | Â | Â | Â | Â | Â |
   <5 years | 21 | 24.3 | 15.0 - 37.1 | 1.0 |  |
   5 - 10 years | 43 | 36.6 | 26.5 - 49.3 | 1.5 | 0.9 - 2.6 |
   >10 years | 29 | 31.3 | 21.0 - 45.0 | 1.3 | 0.7 - 2.3 |
Main drug injected | Â | Â | Â | Â | Â |
   Heroin | 69 | 35.1 ???.4 | 27.3 - 44.5 | 1.4 | 0.9 - 2.3 |
   Methamphetamine | 82 | 32.3 | 25.7 - 40.1 | 1.1 | 0.7 - 2.2 |
   Cocaine | 48 | 34.0 | 25.1 - 45.1 | 1.2 | 0.8 - 1.7 |
   Methadone/buprenorphine | 40 | 40.7 | 29.1 - 55.5 | 1.5 | 1.0 - 2.3 |
Sharing injecting equipment | Â | Â | Â | Â | Â |
   No | 31 | 30.0 | 20.3 - 42.5 | 1.0 |  |
   Yes | 63 | 33.8 | 26.0 - 43.3 | 1.1 | 0.7 - 1.8 |
Receiving MMT | Â | Â | Â | Â | Â |
   No | 58 | 24.6 | 18.6 - 31.7 | 1.0 |  |
   Yes | 36 | 60.1 | 42.1 - 83.2 | 2.5 | 1.6 - 3.7 |