. Investigators want to assess the accuracy of self-reported smoking status. Par
ID: 3129168 • Letter: #
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 hair 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. Hint: Be careful of how the cells are arranged
Nicotine Absent
Nicotine Present
Self-Reported Non-Smoker
82
32
Self-Reported Smoker
3
97
a. What is the sensitivity of self-reported smoking status?
b. What is the specificity of self-reported smoking status?
c. What is the positive predictive value of the laboratory assessment?
d. What is the negative predictive value of the laboratory assessment?
Nicotine Absent
Nicotine Present
Self-Reported Non-Smoker
82
32
Self-Reported Smoker
3
97
Explanation / Answer
Let us arrange in the following order
a) Sensitivity = 97/129 = 0.7520
b) Specificity = 82/85 = 0.9647
c) Posit pred value = 97/100 = 0.97
d) negat pre value = 82/114 = 0.7192
Smoker Yes No Nicotine Yes 97 3 100 No 32 82 114 129 85 214Related Questions
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