Fig. 4

Mass Drug Administration cost per capita per year by setting and scale (USD, 2014). Each curve represents the intervention cost trajectory for the four setting types obtained by fitting a Loess curve to cost estimates modelled at various implementation scales. Shaded areas around the curves illustrate variation in the cost estimate due to different ways in which a given implementation scale can be achieved: by increasing the population size of the HFCA, increasing the number of HFCAs, or increasing the number of districts or regions where the intervention is deployed. Setting types are described in Additional file 1: Table S12. Equivalent figures for other interventions are shown in Additional file 1: Figure S5