You will be assessing the appropriateness of a new screening test for Disease X. Assume a population of 1000 people of whom 100 have Disease X and 900 do not have Disease X to answer questions a through i using the following 2x2 table:

Disease No disease

Positive screen 80 100

Negative screen 20 800

1.Calculate the sensitivity.

2.Interpret your sensitivity calculation and the implications for potential use of this screening test.

3.Calculate the specificity.

4.Interpret your specificity calculation and the implications for potential use of this screening test.

5.Calculate the predictive value of a positive test?

6.Interpret the above calculation and the implications for potential use of this screening test.

7.Calculate the predictive value of a negative test?

8.Interpret the above calculation and the implications for potential use of this screening test.

9.What is your assessment of the use of this screening test for Disease X in practice? Should it be used? Why or why not?