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A cohort study was conducted in Zambia to investigate if using ceramic water filters reduced the risk of diarrheal illness over a one-year time period.

A cohort study was conducted in Zambia to investigate if using ceramic water filters reduced the risk of diarrheal illness over a one-year time period. Using the 2 x 2 table below, calculate the risk differenceto estimate the effect of ceramic filters on diarrhea.

Diarrhea No Diarrhea

Ceramic Filter Use

 79 450
No Ceramic Filter Use 220 500

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