Fig. 5.

The incremental protective efficacy of pirimiphos methyl EC IRS treatment on diagnostic positivity for Plasmodium falciparum malaria infection over several time periods since the last spray round began, relative to clusters that have been sprayed with pirimiphos methyl EC (reference group), estimated exactly as described in Table 2, except that three separate models were fitted for the three different time periods since the last spray round began and the EC formulation of pirimiphos methyl was treated as the reference group