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Associations between age and presence of parasitemia and IgG subclass responses to merozoite antigens of P. falciparum. Children were divided into two age groups, ≤9 years (n = 91) and >9 years (n = 115), to examine associations with age. The presence (Pf Pos [n = 139]) or absence (Pf Neg [n = 67]) of P. falciparum infection was determined by PCR. Data are plotted as box-and-whisker plots (boxes show medians and interquartile ranges; error bars show 95% confidence intervals).
