Table 4.

Predictors of hepatitis B, C, HIV, and syphilis in blood donors.

Variable	Hepatitis B infection		Hepatitis C infection		HIV infection		Syphilis infection
	Unadjusted OR (95% CI)	Adjusted OR (95% CI)	Unadjusted OR (95% CI)	Adjusted OR (95% CI)	Unadjusted OR (95% CI)	Adjusted OR (95% CI)	Unadjusted OR (95% CI)	Adjusted OR (95% CI)
		(n = 2988)		(n = 2988)		(n = 2986)		(n = 2987)
Age	(n = 3352)		(n = 3352)		(n = 3351)		(n = 3351)
Continuous	1.00 (0.98, 1.01)	1.0 (0.98, 1.02)	1.03 (1.0, 1.06)	1.00 (0.98, 1.02)	0.96 (0.94, 0.99)∗	0.97 (0.94, 1.005)	1.03 (1.01, 1.05)∗	1.02 (1.002, 1.05)∗
Location	(n = 2999)				(n = 2997)		(n = 2998)
Urban	1.4 (1.0, 2.1)	1.4 (0.9, 2.1)	0.6 (0.3, 1.4)	1.4 (0.9, 2.1)	1.4 (0.6, 2.8)	1.3 (0.6, 2.8)	1.2 (0.7, 2.1)	1.2 (0.7, 2.0)
Suburban	1.0 (0.7, 1.5)	1.0 (0.6, 1.4)	0.4 (0.2, 0.9)∗	1.2 (0.8, 1.9)	1.1 (0.5, 2.3)	1.1 (0.5, 2.3)	1.3 (0.8, 2.2)	1.3 (0.7, 2.2)
Rural	REF	REF	REF	REF	REF	REF	REF	REF
Gender	(n = 3361)		(n = 3361)		(n = 3359)		(n = 3360)
M	REF	REF	REF	REF	REF	REF	REF	REF
F	1.0 (0.7, 1.3)	0.9 (0.6, 1.3)	1.1 (0.6, 2.0)	0.8 (0.6, 1.2)	0.6 (0.3, 1.2)	0.5 (0.2, 1.2)	0.8 (0.5, 1.2)	0.8 (0.5, 1.3)

^∗Indicating statistical significance. REF: reference.