Fig. 2

Kaplan–Meier ‘survival’ curves showing the cumulative knockdown over the 60 min exposure to diagnostic concentrations of deltamethrin (0.05%) and DDT (4%) in the WHO insecticide susceptibility assay. The log-rank test used for Kaplan–Meier test showed P-values < 0.0001 between Kisumu and rice, vegetable and cocoa sites, respectively