Figure 7
From: Impact on arsenic exposure of a growing proportion of untested wells in Bangladesh
Distribution of distances to the nearest well for a subset of 499 study households residing within villages where the location of every well was determined. The area includes 299 unsafe wells, 294 safe wells, and 1208 untested wells. The survey calculation considers wells known to be safe only; the simulation randomly assigned a safe/unsafe status to the wells of unknown status reflecting the 50/50 proportion throughout the study area. Vertical error bars indicate the range in the proportion of distance categories observed for ten such simulations.