a–c, Overall monthly means of the proportion of A. gambiae s.l. females (a), house density (b), and species composition (c). Nm, Nd, and Ng denote sample size of A. gambiae s.l., the number of collection days, and the number genotyped to species, respectively (Methods). Whiskers in box-whisker plots extend to the extreme values up to 1.5 the distance between the twenty-fifth and seventy-fifth percentiles. In a, blue triangles represent means that are significantly lower than the red triangles (based on the sequential Bonferroni test; see Extended Data Table 1) and the horizontal line represents 1:1 sex ratio.