Epidemiology

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How the bias would affect the measure of association. Would it be under or over estimated?
A cohort study was designed to look at the association of pesticides and the occurrence of childhood leukumia. Children living in rural areas were followed and leukemia rates were compared between those children living in areas with high and low pesticides exposure. pesticide exposure was considered high if it was over 20 "units" and low if it was under 20 "units". The method used to quantify pesticide exposure was accurate to within +/-12 units.

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