A cohort study was conducted in Zambia to investigate if using ceramic water filters reduced the risk of diarrheal illness over a 1 year time period. Using the 2x2 table below, calculate the risk difference to estimate the effect of ceramic filters on diarrhea. Diarrhea No Diarrhea Ceramic Filter Use 79 450 No Ceramic Filter Use 220 500 Group of answer choices A) 0.156, or 15.6 cases per 100 per 100 more among those using ceramic filters compared with those not using filters B) 0.106, or 10 cases per 100 more among those using ceramic filters compared with those not using filters C) -0.156, or 15.6 cases per 100 fewer among those using ceramic filters compared with those not using filters D) -0.209 or 20.9 cases per 100 fewer among those using ceramic filters compared with those not using filters
A cohort study was conducted in Zambia to investigate if using ceramic water filters reduced the risk of diarrheal illness over a 1 year time period. Using the 2x2 table below, calculate the risk difference to estimate the effect of ceramic filters on diarrhea. Diarrhea No Diarrhea Ceramic Filter Use 79 450 No Ceramic Filter Use 220 500 Group of answer choices A) 0.156, or 15.6 cases per 100 per 100 more among those using ceramic filters compared with those not using filters B) 0.106, or 10 cases per 100 more among those using ceramic filters compared with those not using filters C) -0.156, or 15.6 cases per 100 fewer among those using ceramic filters compared with those not using filters D) -0.209 or 20.9 cases per 100 fewer among those using ceramic filters compared with those not using filters
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