Diarrhea accounts for 700 000 deaths per year among children younger than 5 years, 1 or 10.5% of total under-5 mortality. 2 These deaths are largely preventable. An estimated 85% of diarrhea mortality is attributed to unsafe drinking water, inadequate sanitation, and substandard hygiene practices. 3 A recent meta-analysis calculated reductions in diarrhea associated with hand-washing promotion, water quality improvements, and improvements in excreta disposal of 48%, 17%, and 36%, respectively. 4 These estimates have been widely adopted in the international health community. 5,6 Although some studies have found limited evidence of health impact associated with water supply improvements, 7 emerging research suggests that relationships between water supply and diarrhea may be mediated by several factors, including collection time and distance to source.
8,9Estimates of the health impact of water, sanitation, and hygiene (WASH) interventions on children younger than 5 years are derived from interventions that promote or improve services and practices in domestic environments. 4 The impact of WASH improvements at institutions-such as schools-on child diarrhea remains underexplored. WASH interventions in schools can influence diarrheal outcomes among children younger than 5 years who themselves are not attending school through 2 primary pathways. First, these interventions may result in the diffusion of improved practices and behaviors to domestic environments and the broader community. important to understand the extent to which school interventions affect younger children. We analyzed data from a cluster-randomized trial in Kenya to quantify the impact of school WASH improvements on parent-reported diarrhea and clinic visits for gastrointestinal symptoms among children younger than 5 years living in households within the catchment areas of study schools.
METHODSOur study was embedded within a larger trial that assessed the health and educational impacts of WASH improvements carried out in schools in Nyanza Province, Kenya. Following a rapid assessment of school conditions conducted by the Ministry of Education, we divided schools into 2 study groups according to water availability: water-available schools had a dry season water source within 1 kilometer; water-scarce schools had no improved water source within 2 kilometers and no dry season source of any kind within 1 kilometer. We excluded schools that met government-mandated pupil-to-latrine ratios (25 to 1 for girls, 30 to 1 for boys) from the study.
22Objectives. We examined the impact of school water, sanitation, and hygiene (WASH) interventions on diarrhea-related outcomes among younger siblings of school-going children.Methods. We conducted a cluster-randomized trial among 185 schools in Kenya from 2007 to 2009. We assigned schools to 1 of 2 study groups according to water availability. Multilevel logistic regression models, adjusted for baseline measures, assessed differences between intervention and control arms in 1-week period prevalence of diarrhea and 2...