నైరూప్య

Gastrointestinal and respiratory disease epidemiology: Overview.

Zakat Yoshi

To determine whether tap water can be a substantial source of sickness, prospective epidemiologic studies have been conducted since 1989. In order to get rid of microorganisms that might have survived treatment, these research compared groups of families drinking tap water to families drinking tap water that had undergone reverse osmosis. In order to eliminate confounding variables, studies have concentrated on a single water treatment facility and distribution system. The water that the treatment facility produces complies with all Canadian, American, and Quebec Ian laws. All studies rely on lengthy (16 to 18 month) periods of observation of randomly selected families assigned to observation groups.