Figure 2.

Entomological indices over time (one panel per index). The left vertical axis of each panel is the value of the corresponding index (logarithmic scale). The horizontal axis of each panel shows study month, from October (O) 2007 to September (S) 2008. In each panel, the thick lines show the geometric mean value of the index at the three follow-up surveys used to assess the impact of the intervention (gray, ITMs; black, control; red and blue respectively in online version). The thin lines show the values over time (including baseline) for each cluster. The upper two panels also have a right vertical axis, showing rainfall (in millimeters).