Please describe length-bias

Oct 18th, 2015
Price: $5 USD

Question description

Length-bias can be described as:

a. A bias that occurs because screening tends to identify cases with less aggressive forms of the disease

b. An actually longer survival time for persons identified during a screening program because they were

  given an effective treatment

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

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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