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. 2014 Nov 10;60(4):505–513. doi: 10.1093/cid/ciu867

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Published by Oxford University Press on behalf of the Infectious Diseases Society of America 2014. This work is written by (a) US Government employee(s) and is in the public domain in the US.

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Figure 2. — A, Box plots showing distribution of antibody to hepatitis B surface antigen (anti-HBs) levels among subjects in the 3 groups. There was no difference in anti-HBs levels among the 3 groups: group 1 (10–15 years since vaccination), 811 mIU/mL; group 2 (16–20 years since vaccination), 321 mIU/mL; and group 3 (>20 years since vaccination), 371 mIU/mL (P = .1). Average, 25th and 75th percentiles, and range are shown. B, Change in anti-HBs levels over time since initial vaccination. There was no correlation between the magnitude of change in anti-HBs level over time (r² = 0.0013, P = .85). Change was calculated based on last anti-HBs level minus initial anti-HBs level usually obtained 9–12 months after first vaccine dose (n = 36).