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. 2014 Jun 26;9(6):e100860. doi: 10.1371/journal.pone.0100860

Figure 3. Serum positivity rate (SPR), and geometric mean titer (GMT), in relation to age group.

Figure 3

(A, B) SPR for Enzygnost, Immunozym and RFFIT for individuals that have received 3 (A) or 4 (B) vaccine doses. (C, D) GMT with 95% CI measured using Enzygnost for individuals that have received 3 (C) or 4 (D) vaccine doses. (E, F) GMT with 95% CI measured using Immunozym for individuals that have received 3 (E) or 4 (F) vaccine doses. Both SPR (p<0.001, Chi-square test for trend) and GMT (p<0.001, Kruskal-Wallis) decreased significantly with age with all three assays for participants that had received 3 doses. The trend was not significant for participants that had received 4 doses.