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8 Cards in this Set
- Front
- Back
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Define Sensitivity?
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proportion of people w/ disease who have a + test.
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what is a high Sensitivity test?
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a test that is unlikely to produce false negatives
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Define Specificity (Sp)
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Specificity (Sp) is the proportion of people free of a disease who have a negative test
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what is a High Specificity test
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unlikely to produce false positives
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Define positive Predictive Value?
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% of pt. who test positive who actually have the disease
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what affects + Predictive Value?
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prevalence(change in different populations)
A rare disease would have low +PV, even with high Sp and Sn tests! |
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what is likelihood ratio?
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“efficiency” of a test
The likelihood that a test result would be expected in a pt with the target disorder compared to the likelihood that the same result would be expected in a patient w/out that disorder. A RATIO! |
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can prevalence affect LR?
when is LR useful? |
1. Less likely to change with prevalence.
2. Useful when choosing a test or interpreting test results. |
