Investigators want to assess the accuracy of self-reported smoking status. Parti

Question

Investigators want to assess the accuracy of self-reported smoking status. Participants are asked whether they currently smoke or not. In addition, laboratory tests are performed on samples to determine the presence or absence of nicotine. The laboratory assessment is considered the truth about nicotine. Use the data in the following table to answer the questions. What is the sensitivity of self-reported smoking status? What is the specificity of self-reported smoking status? What is the positive predictive value of the laboratory assessment? What is the negative predictive value of the laboratory assessment?

Explanation / Answer

Solution:

A. What is the sensitivity of self-reported smoking status?
a/(a+c) = 97/(97+3) = 0.97

B. What is the specificity of self-reported smoking status?
d/(b+d) = 82/(32+82) = 0.72

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