Fig. 4
Efficacy (mortality) over time of indoor residual spraying of pirimiphos-methyl against wild An. gambiae (s.l.) (a) and susceptible An. gambiae s.s (b). Mortality rates were predicted from a binomial-response mixed effect model. Pirimiphos-methyl at 4 ml/m2 targeted dose applied on mud (dashed lines) or cement (solid lines) walls are compared. Gray areas are 95% confidence interval of predicted means. Mortality values measured on the field are shown as blue circles (cement) and black squares (mud) of size proportional to the number of values (maximum = 20)