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Table 4 Bivariate and multivariate analysis of risk factors for HCV infection

From: Hepatitis C virus infection status and associated factors among a multi-site sample of people who used illicit drugs in the Amazon region

Risk factors All HCV infection
Bivariate OR (95% CI) Multivariate aOR (95% CI)
Age
 Up to 29 years 1.00 1.00
  ≥ 30 years 1.29 (1.02–1.64) 1.10 (1.01–1.75)
Main illicit drugs useda
 Marijuana 1.00 1.00
 Crack/oxi + Cocaine 3.58 (2.15–5.87) 3.24 (2.03–5.38)
Frequency of use of illicit drugsa
 Non-daily 1.00 1.00
 Daily 3.89 (2.96–5.06) 4.01 (2.85–5.62)
Over 12 years using illicit drugs
 No 1.00 1.00
 Yes 29.52 (13.47–52.31) 27.55 (13.78–50.23)
Injection drug useb
 No 1.00 1.00
 Yes 2.71 (2.03–3.57) 3.04 (2.35–4.02)
Sharing of drug use equipmenta
 No 1.00 1.00
 Yes 4.64 (3.80–6.36) 4.18 (3.54–6.07)
Involvement in illicit drug traffickinga
 No 1.00 1.00
 Yes 4.77 (3.61–7.16) 4.26 (3.35–7.49)
Unprotected sexual intercoursea
 No 1.00 1.00
 Yes 1.37 (1.02–1.81) 1.22 (1.01–1.69)
More than 12 sexual partnersa
No 1.00 1.00
Yes 1.28 (1.05–1.59) 1.19 (1.02–1.75)
Tattoos
 No 1.00 1.00
 Yes 4.14 (3.11–5.32) 3.96 (2.84–4.95)
  1. aLast 12 months. bLast 24 months. Factors not associated with HCV infection can be accessed in Additional file 1: Table S1. OR: Odds Ratio. aOR: adjusted Odds Ratio. 95% CI: 95% Confidence interval