Prevalence of Open Defecation. Figure 4 illustrates the most current prevalence and annual rate of change of open defecation for each of the study cities. The cities are ranked bottom to top from most desirable access to poorest access. The colored oval on the right of each bar indicates the annual rate of change, measured in percentage points, for each city. The color of the oval indicates positive (green), negative (red), or minimal change (yellow). See Table S2 for complete data.