Epidemiology - Public Health Lead time bias is best described as: A. an apparent
ID: 245465 • Letter: E
Question
Epidemiology - Public Health
Lead time bias is best described as: A. an apparently lower survival rate among persons screened compared to an unscreened group. B. an actually longer survival time for persons identified during a screening program because they were given an effective treatment. C. a similar survival time for persons identified during a screening program relative to persons who are diagnosed by clinical symptoms. D. an apparently longer survival time among persons identified during a screening program because they were identified at an earlier stage of their disease.
Explanation / Answer
Lead time is the length of time between the detection of a disease and its usual diagnosis. Early diagnosis by screening may not prolong the life of someone.
Correct option: D. An apparently longer survival time among persons identified during a screening program because they were identified at an earlier stage of their disease
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