HTH 450- Sensitivity and Specificity

as prevalence increases, so does ___

PPV

measure of positive yield

PPV

specificity formula

TN/ TN + FP

sensitivity formula

TP/ TP + FN

formula for PPV

a/a+b

formula for NPV

d/d+c

higher sensitivity= fewer people are given ____ _____ results

false negative

NPV is affected by the number of _____ ____

false negatives

high specificity= fewer people are given _____ _____ results

false positive

of those who screen negative, how many are actually negative

negative predictive value (NPV)

of those who screen positive, how many are actually positive?

positive predictive value (PPV)

probability that a test correctly classifies as positive those who have preclinical disease

sensitivity

probability test correctly classifies individuals without preclinical disease as negative

specificity