Updated Seroprevalence of Hepatitis B Surface Antigen and Anti-Hepatitis Core Antibody Among Blood Donors in Yemen

Figures & data

Table 1 The Overall Frequency of HBs Ag and Anti-HBc Ab Among Population of the Study

Blood Donors Categories	Total		HBs Ag				95% CI	P	Anti-HBc Ab				95% CI	P
			Reactive		Non-Reactive				Reactive		Non-Reactive
	N	%	N	%	N	%			N	%	N	%
Duplicated Blood donors	2067	12.6	63	3.0	2004	97.0	0.737–0.970	0.029^a	258	12.5	1809	97.5	0.955–995	0.008^a
Single non-duplicated blood donors	14,300	87.4	324	2.3	13,976	97.3	1.032–1.633		1510	10.6	12,790	89.4	1.044–1.329
All donors	16,367	100.0	387	2.4	15,980	97.6		<0.001^a	1768	10.8	14,599	89.2		<0.001^a

Note: ^aStatistically significant, 95%.

Abbreviations: CI, confidence interval; P < 0.05, significant; N, number; %, percentage.

Table 2 The Frequency of Anti-HBc Ab and HBsAg/Anti-HBc Among Population of the Study

Blood Donors Categories	Total		Anti-HBc Only				95% CI	HBsAg/Anti-HBc				95% CI
			Reactive		Non-Reactive			Reactive		Non-Reactive
	N	%	N	%	N	%		N	%	N	%
Duplicated Blood donors	2067	12.6	258	12.5	1809	97.5	0.955–995	33	1.6	2034	98.4	0.921–2.012
Non-duplicated blood donors	14,300	87.4	1510	10.6	12,790	89.4	1.044–1.329	167	1.7	14,133	98.8	0.532–1.101
All donors	16,367	100.0	1768	10.8	14,599	89.2		200	1.2	16,167	98.8

Abbreviations: N, number; %, percentage; 95% CI, confidence interval.

Table 3 Seropositive Rates of HBs Ag, and Anti-HBc Ab in Relation to Demographic Characteristics of Blood Donors

Demographic Characteristics		Total N =14,300		HBs Ag				Anti-HBc Ab
				Reactive 324 (2.3)		Non-Reactive 13,976 (97.7%)		Reactive 1510 (10.6)		Non-Reactive 12,790 (89.4)
		N	%	N	%	N	%	N	%	N	%
Occupation	Students	2966	20.8	67	2.3	2902	97.7	294	9.9	2672	90.1
	Professional worker	4596	32.1	100	2.2	4496	97.8	504	11.0	4095	89.0
	Military	2058	14.4	48	2.3	2010	97.7	227	11.0	1831	89.0
	Manual workers	4680	32.7	109	2.3	4571	97.7	490	10.5	4190	89.5
	χ2			0.3				2.3
	P			0.961				0.518
Gender	Males	14,148	98.9	321	2.3	13,827	97.7	1497	10.6	12,651	89.3
	Females	152	1.1	3	2.0	149	98.0	13	8.6	139	91.4
	χ2			0.1				0.7
	P			0.808				0.418
Residency	Capital city	8159	57.0	193	2.4	7966	97.6	903	11.1	7256	88.9
	Algand	777	5.4	17	2.2	760	97.8	96	12.4	681	87.6
	Azal	5115	35.8	105	2.1	5010	97.9	481	9.4	4634	90.6
	Sheba	140	1.0	6	4.3	134	95.7	17	12.1	123	87.9
	Tehama	109	0.8	3	2.8	106	97.2	13	11.9	96	88.1
	χ2			4.1				17.1
	P			0.388				0.013^a
Age groups	16–25	4462	31.3	91	2.0	4371	98.0	398	8.9	4062	91.1
	26–35	6964	48.7	159	2.3	6805	97.7	671	9.6	6293	90.4
	36–45	2327	16.3	56	2.4	2271	97.6	319	13.7	2008	86.3
	45–55	497	3.5	16	3.2	481	96.8	106	21.3	391	78.7
	More than 55	50	0.3	2	4.0	48	96.0	16	32.0	34	68.0
	χ2			3.9				127.8
	P			0.418				<0.001^a
Type of donor	Volunteer	3933	27.5	119	3.0	3814	97.0	456	11.6	3477	88.4
	Replacement	10,367	72.5	205	2.0	10,162	98.0	1054	10.2	9313	89.8
	χ2			14.2						6.1
	P			0.000						0.013
Techniques	ECL	11,121	77.8	224	2.0	10,897	98.0	1144	10.3	9977	89.7
	EIA	3179	22.2	100	3.1	3079	96.9	366	11.5	2813	88.5
	χ2			14.3				3.9
	P			<0.001^a				0.047^a

Note: ^aStatistically significant.

Abbreviations: χ2, Chi-square; P< 0.05, significant; N, number; %; percentage.

Table 4 Distributions of Blood Groups and Rh in Relation to HBs Ag and Anti-HBc Ab

Blood Group	Total		Rh Total			HBs Ag				Anti-HBc Ab
						Positive		Negative		Positive		Negative
	N	%		N	%	N	%	N	%	N	%	N	%
O	6152	55.6	+	5593	50.5	131	2.3	5462	97.7	659	11.8	4934	88.2
			-	559	5.1	11	2.0	548	97.7	60	10.7	499	89.3
A	3632	32.8	+	3326	30.0	99	3.0	3227	97.0	414	12.4	2912	87.6
			-	306	2.8	11	3.6	295	96.4	33	10.8	273	89.2
B	991	8.9	+	894	8.1	18	2.0	876	98.0	110	12.3	787	87.7
			-	97	0.9	1	1.0	96	99.0	14	14.4	83	85.6
AB	294	2.7	+	263	2.4	5	1.9	258	98.1	33	12.5	230	87.5
			-	31	0.3	0	0.0	31	0.2	3	9.7	28	90.3
Total	11,069	100.0		11,069	100.0	276	2.5	10,793	97.5	1326	12.0	9743	88.0
χ2						8.8				3.0
P						0.271				0.884

Abbreviations: χ2, Chi-square; P < 0.05, significant; N, number; %, percentage; +, positive; -, negative.