% Reduction in Diarrheal Morbidity per Intervention
0%
10%
20%
30%
Hand washing with soap
44
Point of use water treatment Sanitation Water Supply
40%
39 32
25
Water Treatment 11
Modified From: Fewtrell et al. 2005. Water, Sanitation, and Hygiene Interventions to Reduce Diarrhoea in Less Developed Countries: a Systematic Review and Meta-Analysis. The Lancet Infectious Diseases, Volume 5, Issue 1, January 2005, Pages 42-52.