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

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%.