List the values for each cell: A, B, C, D, A+B, C+D, A+C, B+D, A+B+C+D Calculate the sensitivity of the test. Calculate the specificity of the test. Calculate the positive predictive value for the data. Calculate the negative predictive value for the data. What is the prevalence of the disease?
Read the following study, construct the appropriate 2x2 table for evaluating a screening test, and calculate the listed statistics. Be sure to show your work.
A new screening tool is being tested in European airports detect travelers who are suffering from a febrile rash illness in order to prevent passengers with measles from crossing into a different country. Three thousand (3,000) individuals were screened using this tool. All 3,000 individuals were also tested for measles using a laboratory test. There were 300 people who were positive using the screening test. There were 210 people who were positive for measles using the laboratory test. Among those with a positive laboratory test for measles, 20 tested negative with the screening tool (false negatives).
- 2x2 table
|
|
+ |
- |
Total |
|
+ |
A |
B |
A+B |
|
- |
C |
D |
C+D |
|
Total |
A+C |
B+D |
A+B+C+D |
- List the values for each cell: A, B, C, D, A+B, C+D, A+C, B+D, A+B+C+D
- Calculate the sensitivity of the test.
- Calculate the specificity of the test.
- Calculate the positive predictive value for the data.
- Calculate the negative predictive value for the data.
- What is the prevalence of the disease?
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