Bias in Epidemiologic Research

For the following study descriptions, describe potential bias (es) most likely to be present. Indicate how differential bias would affect the measure of association (would it be underestimated, overestimated or unchanged):

1. A cohort study was designed to look at the association of pesticides and the occurrence of childhood leukemia. Children living in rural areas were followed and leukemia rates were compared between those children living in areas with high and low pesticide exposure. Pesticide exposure was considered high if it was over 20 “units” and low if it was under 20 “units”.

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Media America Bias

Media bias is ever present and seemingly unavoidable in America today. No matter which outlet we choose to get our information, there always seems to be a slant or bias cleverly intermeshed with the truth. It can be a slippery slope to attempt to label the bias that exists. Many conservatives who attack the media as being liberal, do so because it has proven an effective weapon in weakening journalisms’ watchdog function.

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