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8 Cards in this Set

  • Front
  • Back
2 x 2 table
Disease
+ -
+ A B
Exposure
- C D
Sensitivity
A/(A+C)

(true positives/# ppl who actually have diease)
Specificity
D/(B+D)

(true negatives/# ppl who actually don't have disease)
PPV
A/(A+B)

(true positive/# ppl who test positive)

depends on prevalence, sens, and spec
NPV
D/(C+D)

(true negative/# ppl who test negative)

depends on prevalence, sens, and spec
Odds Ratio
for RETROSPECTIVE STUDIES (ie case-control)

(AxD)/(BxC)
Relative Risk
for PROSEPECTIVE STUDIES

[A/(A+B)]/[C/(C+D)]
Attributable Risk
[A/(A+B)] - [C/(C+D)]