Figure 2

Anti- Plasmodium falciparum schizont IgG levels in July 2003. Anti-Plasmodium falciparum schizont IgG antibodies in 338 children presented according to their age class and to the treatment they received in September-October-November 2002 (IPT or placebo). Bars indicate the median value for each sub-group. P values drawn for comparisons between the age groups obtained using multivariate analysis (see Table 1) are displayed above the frame. P values obtained by comparing the IPT and control groups using bivariate analysis (Mann-Whitney test) are displayed within the frame. yo: years old