A test with imperfect sensitivity and specificity is used to measure prevalence

Question

A test with imperfect sensitivity and specificity is used to measure prevalence of disease in two different populations. In population 1 the true prevalence of disease is 50% and in population 2 the true prevalence of disease is 10%. Which of the following statements is true?

a. The sensitivity of the test will be greater in population 1

b. The specificity of the test will be greater in population 1

c. The positive predictive value of the test will be greater in population 1

d. The negative predictive value of the test will be greater in population 1

Explanation / Answer

Answer is option C.The positive predictive value  of the test will be greater in population 1 because higher prevalence means we can get higher true positive.

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