Effects of Prevalence on Diagnostic Tests
2 X 2 Table: Predictive Values
| Breast Cancer |
Total |
||
| Positive |
Negative |
||
| Physical Examination | |||
| Positive (lump) |
20 | 80 | 100 |
| Negative (no lump) | 5 | 695 | 700 |
| Total | 25 | 775 | 800 |
Multi-choiceCalculate the positive and negative predictive values of the physical exam of the breast in the diagnosis of breast cancer. Which of the following are the PPV and NPV of the physical exam?
|
20% and 90%
| |
|
90% and 80%
| |
|
20% and 99%
| |
|
20% and 90%
| |
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80% and 20%
|