Table 4. Risk behaviors associated with HIV, HCV and HBV infection in study population in logistic regression*.

Variables	HIV			HCV			HBV
	COR (95% CI)	AOR (95% CI)	P value	COR (95% CI)	AOR (95% CI)	P value	COR (95% CI)	AOR (95% CI)	P
Main route of drugs use			0.212			0.839			0.991
Non-injecting	1	1		1	1		1	1
Injecting only	1.78 (0.96,3.29)	1.5 (0.78,2.88)		1.25 (0.8,1.94)	1.05 (0.64,1.73)		1.04 (0.64,1.69)	1.00 (0.59,1.71)
Years of injecting drug use			<0.001			<0.001			0.07
>5 yr	1	1		1	1		1	1
≥5 yr	3.11 (2.29,4.23)	2.06 (1.45,2.94)		3.37 (2.57,4.42)	2.26 (1.66,3.08)		0.98 (0.76,1.27)	0.75(0.55,1.02)
Frequency of drug injection			0.208			<0.001			0.711
≤1 time/d	1	1		1	1		1	1
1–3 times/d	1.17 (0.65,2.09)	0.83 (0.44,1.57)	0.566	2.18 (1.48,3.21)	1.69 (1.12,2.55)	0.012	0.71 (0.46,1.11)	0.84 (0.52,1.36)	0.476
≥3times/d	2.09 (1.21,3.62)	1.14 (0.62,2.1)	0.682	4.4 (3,6.44)	2.82 (1.86,4.29)	<0.001	0.75 (0.49,1.13)	0.82 (0.51,1.31)	0.409
Needles/syringes sharing			<0.001			<0.001			0.878
No	1	1		1	1		1	1
Yes	4.48 (3.35,5.99)	3.93 (2.86,5.4)		3.6 (2.59,5.01)	2.63 (1.85,3.75)		1.1 (0.84,1.44)	1.02 (0.75,1.39)
No. of sexual partner			0.247			0.45			0.824
1	1	1		1	1		1	1
>1	0.93 (0.69,1.26)	0.8 (0.55,1.16)		1.07 (0.82,1.41)	0.88 (0.64,1.22)		0.86 (0.65,1.13)	1.04 (0.74,1.45)
Have history of STD			0.359			0.99			0.712
No	1	1					1	1
Yes	1.38 (0.97,1.95)	1.21 (0.81,1.81)		1.46(1.01, 2.11)	0.99(0.66, 1.51)		0.88 (0.61,1.26)	1.08 (0.72,1.6)

Note: * 1410 IDUs entered in the model of logistic regression; Adjusted by all independent variables.

COR, crude odds ratio; AOR, adjusted odds ratio; P value for Likelihood Ratio test.