In a study to determine the incidence of a chronic disease, 150 people were examined at the
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Question:
In a study to determine the incidence of a chronic disease, 150 people were examined at the end of a three-year period. Twelve cases were found, giving a cumulative risk of 8%. Fifty other members of the initial cohort could not be examined; 20 of these 50 could not be examined because they died. Which source of bias may have affected the study?
Group of answer choices
Selection bias: loss to follow-up
Information bias: recall bias
Hawthorne effect
Information bias: interviewer/abstractor bias
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