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Citation Information

Type Journal Article - Clinical Infectious Diseases
Title Using geographic information systems and spatial analysis methods to assess household water access and sanitation coverage in the SHINE trial
Author(s)
Volume 61
Issue suppl 7
Publication (Day/Month/Year) 2015
Page numbers S716-S725
URL https://cid.oxfordjournals.org/content/61/suppl_7/S716.full
Abstract
Access to water and sanitation are important determinants of behavioral responses to hygiene and sanitation interventions. We estimated cluster-specific water access and sanitation coverage to inform a constrained randomization technique in the SHINE trial. Technicians and engineers inspected all public access water sources to ascertain seasonality, function, and geospatial coordinates. Households and water sources were mapped using open-source geospatial software. The distance from each household to the nearest perennial, functional, protected water source was calculated, and for each cluster, the median distance and the proportion of households within <500 m and >1500 m of such a water source. Cluster-specific sanitation coverage was ascertained using a random sample of 13 households per cluster. These parameters were included as covariates in randomization to optimize balance in water and sanitation access across treatment arms at the start of the trial. The observed high variability between clusters in both parameters suggests that constraining on these factors was needed to reduce risk of bias.

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