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8 Cards in this Set

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Relative risk

Incidence of outcome in exposed / incidence among unexposed

Absolute risk reduction

Control event rate - experimental event rate

NNT

1/ARR

Sensitivity

true positive / all with disease (true positives + false negatives)

Specificity

true negative / all without disease (false positives + true negatives)

Positive predictive value

true positives / all test positives

negative predictive value

true negative / all test negatives

as prevalence of a dz increases, what happens to PPV and NPV?

PPV increases and NPV decreases and vice versa