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Table 2 HCV incidence rates in the HITS cohort stratified for demographic and behavioral risk variables (N = 488)

From: Incidence of primary hepatitis C infection and risk factors for transmission in an Australian prisoner cohort

  No. incident cases Incidence rate per 100 p.y. 95% CI Rate ratio§ 95% CI††
Total sample 94 31.6 25.6 - 38.7   
Age at first HCV test      
   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      
   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      
   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      
   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      
   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*      
   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      
   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      
   <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      
   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      
   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      
   No 58 24.6 18.6 - 31.7 1.0  
   Yes 36 60.1 42.1 - 83.2 2.5 1.6 - 3.7
  1. Poisson-exact 95% confidence intervals
  2. § Figures in bold are significant at p < 0.05
  3. ††. Exact method (mid-p)
  4. * Only among inmates who were not continuously in prison included (n = 246)