Proportion of subjects with pneumococcal polysaccharide antibody concentrations >5.0 µg/mL in vaccinated and control villages following vaccination with 1 dose of PCV-7 or serogroup C meningococcal conjugate vaccine (data from CS1–CS3 combined).

The difference in the proportions in the vaccinated and control communities that achieved anti-pneumococcal antibody concentrations ≥5.0 µg/ml were compared in the younger (30 months to 4 years) and older (5 years +) age groups.†adjusted for baseline prevalence,‡p-value for interaction (i.e., to test for a difference in the effect of vaccine in the two age groups).