Suppose a screening test for nicotine, the salivary cotinine test, is researched

Question

Suppose a screening test for nicotine, the salivary cotinine test, is researched in 500 randomly selected persons. The results are given in the table below. The status of the smokers is known through interviewing and is not the test. The test in question is the Salivary Cotinine Test.

Smoking Status

+ Salivary Cotinine

- Salivary Cotinine

Totals

Smoker

95

5

100

Non-Smoker

20

380

400

Totals

115

385

500

Use Baye's Theorem to determine the negative predictive value.

Smoking Status

+ Salivary Cotinine

- Salivary Cotinine

Totals

Smoker

95

5

100

Non-Smoker

20

380

400

Totals

115

385

500

Explanation / Answer

Negative predictive value = 380/(380 + 20) * 100

                                       = 95%

                        

                           

                              

                           

                  

                        

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