Table 2. Association of HIV, HBV, HCV, and syphilis with age, sex, and type of blood donor (n = 10, 226).

Variables	HIV		HBV		HCV		Syphilis
	n (%)	COR (95%CI)	n (%)	COR (95%CI)	n (%)	COR (95%CI)	n (%)	COR (95%CI)
Sex
Male	1621(1.9)	1.03(0.91–1.17)	4800(5.6)	2.07(1.88–2.28)	992(1.2)	1.18(0.99–1.39)	1615(1.9)	1.19(1.04–1.35))
Female	305(1.8)	1	464(2.8)	1	164(1.6)	1	265(1.6)	1
Age (years)
18–25	761(1.7)	1	1684(3.7)	1	458(1.0)	1	332(0.7)	1
26–35	531(1.9)	1.17(1.04–1.30)	1825(6.7)	1.86(1.74–1.99)	307(1.1)	1.12(0.97–1.29)	379(1.4)	1.91(1.65–2.22)
36–45	435(2.3)	1.41(1.25–1.58)	1209(6.5)	1.81(1.68–1.95)	250(1.3)	1.34(1.15–1.56)	515(2.8)	3.87(3.37–4.45)
46–55	173(2.0)	1.21(1.02–1.43)	468(5.5)	1.50(1.35–1.67)	107(1.3)	1.24(1.01–1.54)	520(6.1)	8.80(7.64–10.14)
56–65	26(1.4)	0.84(0.57–1.25)	78(4.2)	1.15(0.91–1.45)	34(1.8)	1.85(1.30–2.63)	134(7.3)	10.66(8.66–13.13)
Region of residence
Arusha	473(1.8)	1	1159(4.4)	1	234(0.9)	1	446(1.7)	1
Kilimanjaro	588(1.8)	0.99(0.88–1.12)	1406(4.2)	0.96(0.89–1.04)	310(0.9)	1.06(0.89–1.25)	512(1.5)	0.91(0.80–1.04)
Manyara	224(1.6)	0.87(0.74–1.03)	780(5.4)	1.26(1.15–1.38)	152(1.1)	1.20(0.98–1.48)	356(2.5)	1.49(1.29–1.71)
Tanga	625(2.3)	1.33(1.18–1.50)	1880(7.1)	1.67(1.54–1.80)	453(1.7)	1.95(1.66–2.28)	560(2.1)	1.26(1.11–1.43)
Others	16(2.6)	1.45(0.87–2.39)	39(6.2)	1.46(1.05–2.02)	7(1.1)	1.27(0.60–2.71)	6(1.0)	1.26(1.11–1.43)
Type of donor
Replacement	484(2.2)	1.22(1.10–1.35)	1414(6.4)	1.35(1.27–1.44)	302(1.4)	1.28(1.12–1.46)	504(2.3)	1.33(1.20–1.48)
Voluntary non remunerated	1442(1.8)	1	3850(4.8)	1	854(1.1)	1	1376(1.7)	1

HIV-Human immunodeficiency virus, HBV-Hepatitis B virus, HCV-Hepatitis C virus, COR-Crude odds ratio, CI-Confidence interval.