Number of samples within each age-cohort, GMCs and seroprevalence of MenC PS-specific IgG (≥2 µg/ml) in the pre- and post-MenC introduction eras.

*P-values calculated for differences between IgG GMC pre- and post-introduction of the MenC vaccine with the Wilcoxon two-sided Z-test.GMC, geometric mean concentration; NA, not applicable; mo, age in months; y, age in years.*采用Wilcoxon双侧Z检验（Wilcoxon two-sided Z-test）计算C群脑膜炎球菌（MenC）疫苗接种前后免疫球蛋白G（IgG）几何平均浓度（GMC，geometric mean concentration）的差异所对应的P值（P-value）。其中，GMC指几何平均浓度；NA指不适用（not applicable）；mo代表以月为单位的年龄；y代表以年为单位的年龄。