Figure 2

Malaria incidence rates and protective efficacy. Correlation between the protective efficacy of each IPTi application during six months after the drug administration (blue circles and line, after IPTi-1; red diamonds and line, after IPTi-2; green triangles and line, after IPTi-3) and malaria incidence rates per PYAR for the same time periods in the placebo arm. A, stratified by month of birth (IPTi-1, R² 0.63, p < 0.003; IPTi-2, R² 0.29, p = 0.07; IPTi-3, R² 0.37, p < 0.04); B, stratified by village of residence (IPTi-1, R² 0.48, p < 0.04; IPTi-2, R² 0.33, p = 0.11; IPTi-3, R² 0.04, p = 0.60). PYAR, person year at risk.