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. 2018 May 15;9:1035. doi: 10.3389/fimmu.2018.01035

Figure 1.

Figure 1

HBsAg-specific antibody concentrations after primary vaccination series. Geometric mean concentrations and 95% confidence intervals of anti-HBs are depicted. Dashed vertical lines indicate the time points of vaccination (weeks 0–4–26). The limit of detection is 0.9 IU/l. Samples below this value were set to 0.45 IU/l. (A) This graph depicts data for young (blue; n = 11) and old (red; n = 7) participants. Mann–Whitney U-test young versus old; *p < 0.05; **p < 0.01. (B) This graph depicts data for young (blue; n = 11) participants, old responders (red; n = 5) and old non-responders (light red; n = 2). Mann–Whitney U-test young versus old responders; *p < 0.05.