Table 1.

Geometric mean titers of anti-HBs by age. Age and total number of children in that age group are indicated in the first and second column. Anti-HBs values <1 mIU/ml were calculated as 1 mIU/ml and those >1000 mIU/ml as 1000 mIU/ml respectively

			Log10 Anti-HBs
Age	No of Cases	Anti-HBs (mIU/ml)	Mean	Std. Dev.
1	77	257.04	2.41	0.71
2	8	100.00	2.00	0.96
3	13	39.81	1.60	0.98
4	20	52.48	1.72	0.42
5	26	23.99	1.38	0.75
6	18	29.51	1.47	0.93
7	22	9.12	0.96	0.75
8	29	8.13	0.91	0.75
9	23	6.03	0.78	0.71
10	29	15.85	1.20	0.82
11	23	9.77	0.99	0.64
12	20	10.96	1.04	0.72
13	25	6.76	0.83	0.60
14	17	9.12	0.96	0.75
15	16	2.04	0.31	0.46
16	18	6.61	0.82	0.74
17–19	16	5.25	0.72	0.76
Total	400	21.38	1.33	0.95