Figure 4From: Global numbers of infection and disease burden of soil transmitted helminth infections in 2010Comparison of regional mean prevalence estimates for 2010 and 1990, by species. Grey bars show sub-regional means for 1990, white bars sub-regional means for 2010; red line shows the change in overall regional mean prevalence between 1990 (filled circle) and 2010 (open circle).Back to article page