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8 Cards in this Set
- Front
- Back
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2 x 2 table
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Disease
+ - + A B Exposure - C D |
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Sensitivity
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A/(A+C)
(true positives/# ppl who actually have diease) |
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Specificity
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D/(B+D)
(true negatives/# ppl who actually don't have disease) |
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PPV
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A/(A+B)
(true positive/# ppl who test positive) depends on prevalence, sens, and spec |
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NPV
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D/(C+D)
(true negative/# ppl who test negative) depends on prevalence, sens, and spec |
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Odds Ratio
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for RETROSPECTIVE STUDIES (ie case-control)
(AxD)/(BxC) |
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Relative Risk
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for PROSEPECTIVE STUDIES
[A/(A+B)]/[C/(C+D)] |
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Attributable Risk
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[A/(A+B)] - [C/(C+D)]
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