Question

Lead time bias is best described as which ONE of the following: an apparently lower survival...

Lead time bias is best described as which ONE of the following:

  1. an apparently lower survival rate among persons screened

compared to an unscreened group

  1. an actually longer survival time for persons identified during a

screening program because they were given an effective treatment

  1. an apparently longer survival time among persons identified during

a screening program because they were identified at an earlier

stage of their disease

  1. a similar survival time for persons identified during a screening

program relative to persons who are diagnosed by clinical

symptoms

  1. none of the above
Math   Statistics-And-Probability   
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Homework Answers

Answer #1

Let's take a look at a chart we saw earlier. Here the disease starts in 1985, is diagnosed in 1992 and the person dies of that disease in 1995. How long is his survival? Three years.

Now we institute an effective screening program. The disease starts in 1985 and is detected by the screening program in 1989. The person dies of the disease in 1995. How long was the survival? Six years. Screening seems to have increased their survival time, correct?

C option

  1. 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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