The graph is from this paper by Marc A. Jeuland, David E. Fuente, Semra Ozdemir, Maura C. Allaire, & Dale Whittington. In the graph "WSH" means water, sanitation, and hygiene.
The authors talk about the long term benefits of improved access to water and sanitation, which are probably the most effective factors against some infections diseases and malnutrition in children in developing countries.
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