Figure 2.

Protective efficacies for intervals of 61 days for six months after each SP administration (A, IPTi-1; B, IPTi-2; C, IPTi-3). Solid lines, protective efficacy; vertical bars, 95% confidence intervals. The first 61-day interval started at the time of an IPTi application and the last interval ended at the time of the next IPTi application or 6 months after the last IPTi application (IPTi-3). Protective efficacy against multiple malaria episodes determined by Poisson regression and defined as one minus rate ratio. Children were not rated at risk for malaria for 21 days after preceding malaria episodes or after antimalarial treatment.