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.