Lead time bias is best described as: A)an actually longer survival time for pers

Question

Lead time bias is best described as:

A)an actually longer survival time for persons identified during a screening program because they were given an effective treatment

B)an apparently lower survival rate among persons screened compared to an unscreened group

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

This is a poor method of evaluating screening principally because of what is called lead time bias.

Here the answer is (B)

An apparently lower survival rate among persons screened compared to an unscreened group.

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