A 12-year cohort study on the efficacy of plasma-derived hepatitis B vaccine in rural newborns

Table 2 HBsAg person-year positive conversion for immunized children

Follow-up (year)	Mother HBsAg (-)			Mother HBsAg (+)
	NO. person year	NO. positively converted	Annual positive conversion rate	NO. person year	NO. positively converted	Annual positive conversion rate
1	9.0	0	0.00	9.5	0	0.00
2	76.0	0	0.00	33.5	0	0.00
3	183.0	0	0.00	49.5	0	0.00
4	288.0	0	0.00	51.0	0	0.00
5	454.0	2	0.44	55.5	1	1.80
6	428.0	0	0.00	57.0	0	0.00
7	450.0	0	0.00	56.0	0	0.00
8	602.0	0	0.00	57.0	0	0.00
9	482.0	2	0.34	52.0	0	0.00
10	486.0	1	0.20	35.5	0	0.00
11	292.5	0	0.00	26.5	0	0.00
12	298.5	0	0.00	25.0	0	0.00
Total	4150.0	5	0.12	508.0	1	0.20