Researchers Are Interested in the Association Between Colorectal Carcinoma and Nonsteroidal

question 109

Multiple Choice

Researchers are interested in the association between colorectal carcinoma and nonsteroidal anti-inflammatory drug use.  They first interview a group of patients with biopsy-proven colorectal carcinoma and then interview a group consisting of the patients' neighbors who are of similar age and race.  The analysis is based on comparing the results of pairs of individuals (one from each of the 2 groups) who have similar characteristics.  This design technique best helps address which of the following potential problems with this study?

• A)Ascertainment bias
• B)Confounding
• C)Observer bias
• D)Recall bias
• E)Selection bias

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