Figure 5
From: The global limits and population at risk of soil-transmitted helminth infections in 2010
Boxplots showing the distribution of helminth survey data by population density classification, for (A) hookworm, (B) A. lumbricoides and (C) T. trichiura. Urban areas are defined using Urban Extents (UE) from the Global Urban Rural Mapping Project (GRUMP); peri-urban defined as <15 km from the UE edge and having population densities >250/km2, rural as >15 km from the UE edge and/or population density <250/km2 and extreme rural population density <1/km2 using an updated Gridded Population of the World (GPW3) population database. The thick black line indicates the median, the box, the 25th and 75th percentile, whiskers indicate the range of the data and dots extreme outliers.