Long-term effectiveness of infancy low-dose hepatitis B vaccine immunization in Zhuang minority area in China

Table 1 Comparison of anti-HBs-positive rates between the immuni zed children and the unimmunized children

Age group (year)	Immunized children			Unimmunized children
	n	Positivea	%	n	Positivea	%
1	219	165	75.3	759	117	15.4
3	317	198	62.5	539	121	22.4
5	310	148	44.7	590	204	34.6
7	248	131	52.8	655	238	36.3
9	89	49	55.1	364	125	34.1
Total	1183	691	58.4	2907	805	27.7

^aAnti-HBs-positive was defined as S/N ratio ≥ 5.

Table 2 Anti-HBc-positive rates between the immunized and the unim munized children

Age group (year)	Immunized children			Unimmunized children
	n	Positivea	%	n	Positivea	%
1	219	7	3.2	759	85	11.2
3	317	8	2.5	539	92	17.1
5	310	16	5.2	590	142	24.1
7	248	9	3.6	655	181	27.6
9	89	8	9.0	364	111	30.5
Total	1183	48	4.1	2907	611	21.0

^aAnti-HBc-positive was defined as inhibitory ratio ≥ 75%.

Table 3 HBsAg-positive rates between the immunized and the unimmuni zed children

Age group (year)	Immunized children			Unimmunized children
	n	Positivea	%	n	Positivea	%
1	219	2	1.6	1 115	56	5.0
3	317	3	1.0	638	98	15.4
5	310	7	2.3	691	131	18.9
7	248	4	1.6	772	147	19.0
9	89	2	2.3	429	77	18.0
Total	1183	19	1.6	3645	509	14.0

^aHBsAg-positive was defined as S/N ratio ≥ 5.

Table 4 Comparison of HBsAg-positive mothers between case and control groups

Positive HBsAg of mother	Case group	Control group	Total	OR	P
Yes	23	84	107	9.16	< 0.01
No	13	435	448
Total	36	519	555