Table 3.

Low Anti-HBs Titers at 1 or 2 Years Post-vaccination was Associated with Primary Response.

	<10 mIU/mL
Primary response	1 year post-vaccination	2 years post-vaccination
10-100	17/38 (44.7%)*	9/10 (90.0%)*
100<	1/209 (0.5%)	8/81 (9.9%)

*p<0.05, anti-HBs titer of 10-100 mIU/mL vs. anti-HBs titer >100 mIU/mL