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2 × 2 Table Used to Calculate Diagnostic Accuracy of Each Testa
| Disease | ||
|---|---|---|
| Test | Positive | Negative |
| Positive | True positive (TP) | False positive (FP) |
| Negative | False negative (FN) | True negative (TN) |
aValues were calculated with the following formulas: sensitivity = TP/(TP + FN); specificity = TN/(TN + FP); positive predictive value = TP/(TP + FP); negative predictive value = TN/(FN + TN); accuracy = (TP + TN)/(TP + FP + FN + TN); and likelihood ratio = sensitivity/(1 – specificity).
