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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