Table 3.

Univariable and Multivariable Logistic Regression Models for 1-1 Match Case-Control to Predict HCV Infection, n = 65 Pairs, Male Injection Drug Users, Bac Ninh Province, Vietnam.

Effect	Univariable Models			Multivariable Model*
	OR	95% CI	p-value	OR	95% CI	p-value
Length of drug injection (yrs)**	1.46	1.15–1.84	0.002	1.47	1.12–1.92	0.006
Injecting heroin mixed with benzodiazepine, ever	3.50	0.73–16.85	0.118	1.70	0.24–11.9	0.591
Injecting drugs with needles previously used by another, past 6 months	2.14	0.87–5.25	0.096	3.21	1.02–10.05	0.046
Sharing drug solution through frontloading, last injection	2.60	0.93–7.29	0.069	4.63	1.24–17.24	0.023
No. of sexual partners, past 12 months	0.89	0.79–0.99	0.036	0.91	0.76–1.10	0.330
Having had sex with a female sex worker, past 12 months	0.55	0.26–1.15	0.111	0.95	0.21–4.25	0.941

OR denotes odds ratio; CI, confidence interval;

^*Multivariable model included all variables in the table;

^**Odds ratio for one year increase.