Table 1 Odds ratios and 95% confidence intervals for univariate analysis of HCV serostatus.

Respondent variables

Years of injection drug use (quartiles)

0–6

81 (48.5)

20 (10.1)

1.0

7–13

46 (27.5)

51 (25.8)

4.5 (2.4–8.4)

<0.001

14–21

19 (11.4)

61 (30.8)

13.0 (6.4–26.5)

<0.001

22–39

21 (12.6)

66 (33.3)

12.7 (6.4–25.5)

<0.001

Gender

Male

96 (57.5)

113 (57.1)

1.0

Female

71 (42.5)

85 (42.9)

1.0 (0.7–1.5)

0.937

Education level

< grade 12

116 (69.5)

142 (71.7)

1.0

> grade 12

51 (30.5)

56 (28.3)

0.9 (0.6–1.4)

0.637

Ethnicity

Caucasian

71 (42.5)

57 (28.8)

1.0

Aboriginal

96 (57.5)

141 (71.2)

1.8 (1.2–2.8)

0.006

Moved to Winnipeg in past year

No

112 (67.1)

153 (77.3)

1.0

Yes

55 (32.9)

45 (22.7)

0.6 (0.4–1.0)

0.030

Deals drugs

No

85 (50.9)

107 (54.0)

1.0

Yes

82 (49.1)

91 (46.0)

0.9 (0.6–1.3)

0.549

Cocaine use

No

62 (37.1)

69 (34.9)

1.0

Yes

105 (62.9)

129 (65.1)

1.1 (0.7–1.7)

0.651

Talwin/ritalin use

No

134 (80.2)

113 (57.1)

1.0

Yes

33 (19.8)

85 (42.9)

3.1 (1.9–4.9)

<0.001

Morphine use

No

110 (65.9)

121 (61.1)

1.0

Yes

57 (34.1)

77 (38.9)

1.2 (0.8–1.9)

0.347

Heroin use

No

145 (86.8)

184 (92.9)

1.0

Yes

22 (13.2)

14 (7.1)

0.5 (0.2–1.0)

0.052

Injects daily

No

20 (12.0)

43 (21.7)

1.0

Yes

147 (88.0)

155 (78.3)

0.5 (0.3–0.9)

0.013

Injected at a hotel

No

109 (65.3)

107 (54.0)

1.0

Yes

58 (34.7)

91 (46.0)

1.6 (1.0–2.4)

0.029

Injected at a shooting gallery

No

153 (91.6)

156 (78.8)

1.0

Yes

14 (8.4)

42 (21.2)

2.9 (1.5–5.6)

<0.001

Ever used someone else's syringe

No

90 (53.9)

49 (24.8)

1.0

Yes

77 (46.1)

149 (75.3)

3.6 (2.3–5.5)

<0.001

Injected someone else as a service

No

144 (86.2)

125 (63.1)

1.0

Yes

23 (13.8)

73 (36.9)

3.7 (2.2–6.2)

<0.001

Obtains syringes from friends

No

50 (29.9)

73 (36.9)

1.0

Yes

117 (70.1)

125 (63.1)

0.7 (0.5–1.1)

0.162

Obtains syringes from questionable sources

No

135 (80.8)

144 (72.7)

1.0

Yes

32 (19.2)

54 (27.3)

1.6 (1.0–2.6)

0.067

Opposite-sex regular partners

No

51 (30.5)

65 (31.8)

1.0

Yes

116 (69.5)

163 (68.2)

0.9 (0.6–1.4)

0.640

Opposite-sex casual partners

No

101 (60.5)

129 (65.2)

1.0

Yes

66 (39.5)

69 (34.9)

0.8 (0.5–1.3)

0.357

Opposite-sex client partners

No

151 (90.4)

163 (82.3)

1.0

Yes

16 (9.6)

35 (17.7)

2.0 (1.1–3.8)

0.024

Regular same-sex partners

No

160 (95.8)

195 (98.5)

1.0

Yes

7 (4.2)

3 (1.5)

0.4 (0.1–1.4)

0.116

Casual same-sex partners

No

160 (95.8)

191 (96.5)

1.0

Yes

7 (4.2)

7 (3.5)

0.8 (0.3–2.4)

0.745

Client same-sex partners

No

163 (97.6)

194 (98.0)

1.0

Yes

4 (2.4)

4 (2.0)

0.8 (0.2–3.4)

0.808

Egocentric network variables (maximum number of network members = 20)

Total number of IDU in network

Median (IQR)

3 (1,5)

3 (1,5)

1.0 (1.0–1.1)

0.194

Total number of IDU family members in network

Median (IQR)

0 (0,0)

0 (0,1)

1.29 (1.1–1.6)

0.10

Spouse IDU in network

No

109 (65.3)

127 (64.1)

1.0

Yes

58 (34.7)

71 (35.9)

1.1 (0.7–1.6)

0.822

IDU risk network variables (maximum number of IDU = 5)

Number of IDU respondent sees daily

None

54 (32.3)

66 (33.3)

1.0

1

55 (32.9)

68 (34.3)

1.0 (0.6–1.7)

0.964

2

32 (19.2)

30 (15.2)

0.8 (0.4–1.4)

0.398

3–5

26 (15.6)

34 (17.2)

1.1 (0.6–2.0)

0.832

Number of IDU in network who inject daily

None

104 (62.3)

105 (53.0)

1.0

1

32 (19.2)

36 (18.2)

1.1 (0.6–1.9)

0.699

2

19 (11.4)

31 (15.7)

1.6 (0.9–3.0)

0.137

3–5

12 (7.2)

26 (13.1)

2.1 (1.0–4.5)

0.042

Number of IDU in network who have been IDU for >5 years

0

101 (60.5)

74 (37.4)

1.0

1

28 (16.8)

40 (20.2)

1.9 (1.1–3.4)

0.021

2

18 (10.8)

39 (19.7)

3.0 (1.6–5.6)

0.001

3–5

20 (12.0)

45 (22.7)

3.1 (1.7–5.6)

<0.001

Number of IDU in network who have injected at a hotel

0

117 (70.1)

112 (56.6)

1.0

1

29 (17.4)

39 (19.7)

1.4 (0.8–2.4)

0.222

2–5

21 (12.6)

47 (23.7)

2.3 (1.3–4.2)

0.004

Number of IDU in network who have injected at a shooting gallery

0

134 (80.2)

143 (72.2)

1.0

1

18 (10.8)

27 (13.6)

1.4 (0.7–2.7)

0.298

2–5

15 (9.0)

28 (14.1)

1.7 (0.9–3.4)

0.102

Number of IDU in network with whom respondent has pooled money

0

51 (30.5)

56 (28.3)

1.0

1

42 (25.2)

54 (27.3)

1.2 (0.7–2.0)

0.576

2–3

43 (25.8)

55 (27.8)

1.2 (0.7–2.0)

0.587

4–5

31 (18.6)

33 (16.7)

1.0 (0.5–1.8)

0.922

Number of IDU in network who have used a syringe before the respondent used it

0

133 (79.6)

146 (73.7)

1.0

1

27 (16.2)

32 (16.2)

1.1 (0.6–1.9)

0.790

2–5

7 (4.2)

20 (10.1)

2.6 (1.1–6.4)

0.036

Number of IDU in network who have used other drug paraphernalia before respondent has used it.

0

105 (62.9)

119 (60.1)

1.0

1

29 (17.4)

31 (16.7)

0.9 (0.5–1.7)

0.841

2–5

33 (19.8)

48 (24.2)

1.3 (0.8–2.1)

0.342

Number of IDU in network who have initiated respondent to injection drug use

0

110 (65.9)

157 (79.3)

1.0

1

48 (28.8)

35 (17.7)

0.5 (0.3–0.8)

0.008

2–5

9 (5.4)

6 (3.0)

0.5 (0.2–1.4)

0.160

Number of IDU in network who have shown respondent how to inject drugs

0

104 (62.3)

147 (74.2)

1.0

1

43 (25.8)

39 (19.7)

0.6 (0.4–1.1)

0.083

2–5

20 (12.0)

12 (6.1)

0.4 (0.2–0.9)

0.027

Number of IDU in network who have injected respondent with drugs

0

89 (53.3)

88 (44.4)

1.0

1

44 (26.4)

54 (27.3)

1.2 (0.8–2.0)

0.392

2–5

34 (20.4)

56 (28.3)

1.7 (1.0–2.8)

0.054

Number of IDU in network who have used talwin/ritalin

0

139 (83.2)

119 (60.1)

1.0

1–3

17 (10.1)

42 (21.1)

2.9 (1.6–5.3)

<0.001

4–5

11 (6.6)

37 (18.7)

3.9 (1.9–8.0)

<0.001

Number of IDU in network who have used cocaine

0

113 (67.7)

120 (60.6)

1.0

1

23 (13.8)

36 (18.2)

1.5 (0.8–2.6)

0.192

2–3

17 (10.2)

30 (15.2)

1.7 (0.9–3.2)

0.125

4–5

14 (8.4)

12 (6.1)

0.8 (0.4–1.8)

0.605

Number of IDU in network who have used morphine

0

129 (77.3)

149 (75.3)

1.0

1

22 (13.2)

31 (15.7)

1.2 (0.7–2.2)

0.513

2–5

16 (9.6)

18 (9.1)

1.0 (0.5–2.0)

0.942