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. 2015 Nov 10;15:509. doi: 10.1186/s12879-015-1236-x

Fig. 1.

Fig. 1

Distribution curves of anti-VZV concentration of Beijing residents in 2012 by a age group, b gender and c vaccine vaccination (n = 2157). There were statistically significant differences in anti-VZV concentrations between age groups (P < 0.001) and vaccination status (P < 0.001), but no difference between gender (P = 0.221), by x 2 test