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The GMCs for baseline anti-pneumococcal IgG concentrations of PPSV23-covered serotypes among age and agender groups. (a) The GMCs for baseline anti-pneumococcal IgG concentrations in the middle-aged and elderly groups. (b) The GMCs for baseline anti-pneumococcal IgG concentrations in the male and female groups. *, p < 0.05; **, p < 0.01; ***, p < 0.001 (Mann–Whitney U test).
