Ch04-9781975113285

1 6   INTERNSHIP SURVIVAL GUIDE

All with positive test = A + B Positive predictive value (PPV) = [A/(A + B)] All with negative test = C + D

Negative predictive value (NPV) = [D/(C + D)]

D

B

Disease No disease

False positive (FP)

True negative (TN)

All without disease = B + D Specificity = [D/(B + D)]

A

C

Positive test True positive (TP)

Negative test False negative (FN)

All with disease = A + C Sensitivity = [A/(A + C)]

Figure 4-1. Medical epidemiology.

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