Table 3. Multiple Logistic Regressions of Risk Factors for Hepatitis C Virus Antibody and Hepatitis B Core Antibody.

	Odds Ratio	95% CI	P value
HCV-Ab a
Drug injection		2.91-209.01	< 0.001
Yes	24.68
No	1
History of illegal sex		2.10-30.65	< 0.001
Yes	8.01
No	1
HBc-Ab a
Drug injection		2.2-128.09	< 0.001
Yes	16.78
No	1
Age, y	1.06	1.01-1.12	< 0.05

^a Abbreviations: HCV-Ab, hepatitis C virus antibody; HBc-Ab, hepatitis B core antibody