Effects of Prevalence on Diagnostic Tests
Effects of Prevalence on Diagnostic Tests
Clinical Scenario 1
2 X 2 Table: Sensitivity and Specificity
2 X 2 Table: Predictive Values
Interpretation
Prevalence
Clinical Scenario 2
Properties of Diagnostic Tests
Pre-test Probability
Clinical Scenario 3
Summary
Credits
Interpretation
Reflection
Interpret the test statistics you calculated for the physical exam.
SENS: Inpatients with breast cancer, the exam detected a lump in 80%.
SPEC: In patients without breast cancer, the exam was normal (did not detect a lump) in 90%.
PPV: 20% of the patients found to have lumps will have breast cancer.
NPV: 99% of the patients found to have normal breasts on examination will not have breast cancer.
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Reflection
Reflection
Reflection
Reflection