Table 4.

Socio–demographic characteristics of blood donors by HIV and Syphilis sero positivity at Gondar University Teaching Hospital in Northwest Ethiopia 2003-2007

Characteristics	HIV Positive N (%)	OR (95% CI)	P-Values	Syphilis Positive N (%)	OR (95% CI)	P-Values
Age group (years)
17 – 25	105/3357 (3.1)	1.03 (0.61 - 1.74)	0.902	31/3357 (0.9)	0.64 (0.30 - 1.41)	0.271
26 – 35	79/1686 (4.7)	1.57 (0.92 - 2.68)	0.096	28/1686 (1.7)	1.17 (0.53 - 2.58)	0.702
36 – 45	38/757 (5.0)	1.69 (0.94 - 3.03)	0.077	16/757 (2.1)	1.49 (0.63 - 3.51)	0.359
> 45	17/561 (3.0)	1.00	-	8/561 (1.4)	1.00	-
Gender
Male	188/5592 (3.4)	1.00	-	76/5592 (1.4)	1.00	-
Female	51/769 (6.6)	2.04 (1.48 - 2.81)	<0.001	7/769 (0.9)	0.67 (0.31 - 1.45)	0.307
Occupation
Student	34/1347 (2.5)	1.00	_	9/1347 (0.7)	1.00	_
Daily labourer	53/1769 (3.0)	1.19 (0.77 - 1.85)	0.429	38/1769 (2.1)	3.26 (1.57 - 6.77)	0.001
Farmer	56/1575 (3.6)	1.42 (0.92 - 2.19)	0.109	20/1575 (1.3)	1.91 (0.87- 4.21)	0.108
Housewife	26/212 (12.3)	5.40 (3.17 - 9.20)	<0.001	3/212 (1.4)	2.13 (0.57 - 7.95)	0.258
Govt.employee	17/599 (2.8)	1.13 (0.63 - 2.04)	0.689	0/599	-	-
Merchant	23/333 (6.9)	2.87 (1.66 - 4.93)	<0.001	4/333 (1.2)	1.81 (0.55-5.91)	0.327
Military	4/47 (8.5)	3.59 (1.22 -10.57)	0.020	0/47	-	-
Driver	7/120 (5.8)	2.39 (1.04 - 5.52)	0.041	1/120 (0.8)	1.25 (0.16 - 9.95)	0.833
Construction worker	19/359 (5.3)	2.16 (1.22 - 3.83)	0.009	8/359 (2.2)	3.39 (1.30 - 8.85)	0.013
Number of donation
First donation	212/4372 (4.8)	3.70 (2.47 - 5.55)	<0.001	56/4372 (1.3)	0.94 (0.59 - 1.50)	0.803
Repeat donation	27/1989 (1.4)	1.00	-	27/1989 (1.4)	1.00	-
HIV status
Positive	-	-	-	19/239 (7.9)	8.18 (4.81- 13.88)	<0.001
Negative	-	-	-	64/6122 (1.0)	1.00	-

OR = Odds ratio; CI = Confidence interval; N = Negative