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Participation Questions
List five characteristics of a good screening program.
In your own words, define:
Length time bias
Lead time bias
How does the prevalence of a condition impact the positive predictive value? (Hint: review the formula for positive predictive value.)
From Friis Chapter 11, Questions 7 & 8:
7. A new test was compared with a gold standard measurement with the following results:
Gold Standard
New Test + –
+ 18 2
– 8 72
What is the sensitivity and specificity of this test?
8. Using the data from question 7, what is the positive predictive value and the negative predictive value?