Accuracy table
Information on the accuracy of a diagnostic test can be put into a table. Disease presence or absence must be determined by some means and this is usually called the 'gold' or 'reference' standard.
| Disease present | Disease absent | |||||
|---|---|---|---|---|---|---|
| Test positive | True positive | False positive | ||||
| Test negative | False negative | True negative | ||||
| Total | TP + FN | FP + TN | ||||
Sensitivity (the proportion of patients with disease who have a positive test) = true positive divided by true positive plus false negative.
Sensitivity = TP/(TP + FN)
Specificity (the proportion of patients without the disease who have a negative result) = true negative divided by true negative plus false positive.
Specificity = TN/(TN + FP)
Please drag and drop the correct definition into each box below.
Sensitivity = TP/ (TP + FN) =
- the proportion of patients with disease who have a positive test
Specificity = TN/ (TN + FP) =
- the proportion of patients without the disease who have a negative test
- the proportion of patients with disease who have a positive test
- the proportion of patients without the disease who have a negative test