Fig. 3

The incremental protective efficacy of each of the four IRS treatments on diagnostic positivity for Plasmodium falciparum malaria infection over several time periods since the last spray round began, relative to clusters that has either never been sprayed or had last been sprayed >12 months ago (reference group), estimated exactly as described in Table 1 (a deltamethrin, b lambdacyhalothrin, c EC pirimiphos methyl and d CS pirimiphos methyl)