Table 4.

Covariate-adjusted associations between self-reported Hepatitis C virus (HCV) positivity and lifetime prescription opioid injection among 162 young IDUs^a.

Variable	Adjusted incidence rate ratio (IRR) (95% CI)
Injected PO	2.69 (1.07–6.78)*
PO substituted for heroin	2.28 (1.02–5.10)*
Poor/working class growing up	1.67 (1.09–2.57)*
Age	1.12 (1.02–1.23)*
Age of 1st injection of any drug	0.87 (0.80–0.94)***
Lifetime prescribed stimulants	0.64 (0.42–0.97)*

^aAll variables significant at p<0.1 found in Tables 2 and 3 were included in the initial model with the exception of “Duration of PO injection in years”.

Including this variable would have reduced the analytical sample size to 117.

^***p<0.001,

^*p<0.05.