Disease present | Disease absent | |
Test positive | A | B |
Test negative | C | D |
Sensitivity = A ÷ (A + C) | ||
Specificity = D ÷ (B + D) | ||
Accuracy = (A + D) ÷ (A + B + C + D) | ||
Positive predictive value = A ÷ (A + B) | ||
Negative predictive value = D ÷ (C + D) |
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