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Definitions of sensitivity, specificity, and positive and negative predictive values
Definitions of sensitivity, specificity, and positive and negative predictive values
Disease present
Disease absent
Test positive
A
B
Test negative
C
D
Sensitivity = A ÷ (A + C)
Specificity = D ÷ (B + D)
Positive predictive value = A ÷ (A + B)
Negative predictive value = D ÷ (C + D)
Graphic 77832 Version 3.0
