7. As part of the study described in Problem 6, investigators wanted to assess t

Question

7. As part of the study described in Problem 6, investigators wanted 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 hair samples to determined the presence or absence of nicotine. The laboratory assessment is considered the gold standard, or the truth about nicotine consumption. a. What is the sensitivity of the self –reported smoking status? b. What is the specificity of the self- reported smoking status?

Explanation / Answer

a. Sensitivity correspond to true positive value (that is percentage of nicotine in hair samples of smokers).

b. Specificity refers to true negative value (that is percentage of absence of nicotine in hair samples of non-smokers)

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