Table 7 Factors significantly associated with an HCV positive (HCV+) test in univariate tests and binary logistic regression (forward stepwise selection)

HCV+

% HCV+

% total

Sig

Odds ratio

Lower

Upper

Injection

< 0.0001

22.250

5.294

93.518

 Yes

33.3

66.3

 No

3.3

33.7

NSS

< 0.0001

15.579

7.205

33.688

 Yes

48.1

40.3

 No

5.6

59.7

Craving

< 0.0001

9.26

4.83

4.83–17.74

 Yes

49.4

33.2

 No

9.5

66.6

Police

< 0.0001

3.519

1.858

6.663

 Yes

36.5

44.6

 No

14.1

55.2

SDU or GP

< 0.0001

0.191

0.100

0.366

 Yes

29.9

69.8

 No

6.2

30.2

OST

< 0.0001

4.959

2.444

10.060

 Yes

29.8

67.8

 No

8.1

32.2

SDU

< 0.0001

3.420

1.814

6.450

 Yes

42.1

21.3

 No

17.5

78.7

Prison

0.009

2.279

1.212

4.274

 Yes

29.9

57.4

 No

15.7

42.6

Logistic regression

B

Wald

Sig

Odds ratio

Lower

Upper

 NSS

0.108

17.440

< 0.0001

1.115

1.080

1.174

 Drug use

− 2.623

33.403

< 0.0001

0.73

0.30

0.177

 Police

− 1.190

8.310

0.004

0.323

0.150

0.697

 Constant

− 1.939

8.310

0.002