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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)