A Group of Researchers Conducted a Case-Control Study to Estimate

question 63

Multiple Choice

A group of researchers conducted a case-control study to estimate the association between exposure to a certain pesticide and head and neck squamous cell carcinomas.  Controls were matched to cases by age and gender.  Exposure status was determined by interviewing the subjects.  On matched-pair analysis, the odds ratio is 7.5 (95% confidence interval: 2.3-14.8) .  Based on this information, which of the following is most likely to affect the validity of this study?

• A)Confounding bias by age
• B)Healthy worker bias
• C)Misclassification bias
• D)Nonresponse bias
• E)Placebo effect

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Ship Building

The construction and design of ships and other floating vessels, a specialized industry that requires engineering and manufacturing skills.

Multiple-Stage Processes

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