The Sonoma Water Evaluation Trial (SWET): A randomized drinking ...

Courtesy Recent Science Inventory records from the EPA  Mon, 12/07/2009 - 08:24

Objectives. We estimate the risk of highly credible gastrointestinal illness (HCGI) among adults 55 and older in a community drinking tap water meeting current U.S. standards.

Methods. We conducted a randomized, triple-blinded, crossover trial in 714 households (988 individuals). Households were assigned randomly to active or sham water filtration devices for six months before switching to the opposite device for six months.

We estimated the incidence rate ratio of HCGI episodes and the longitudinal prevalence ratio of HCGI days at...

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