Open Access
Table 4
Terms of the sensitivity and specificity measurements.
| Retreat case | Non-retreat case | ||
|---|---|---|---|
| Test positive to predict retreat cases | True Positives (TP) | False Positives (FP) | Total test positives |
| Retreat cases | Retreat cases | ||
| a (TP) | b (FP) | a + b | |
| Test positive to predict non-retreat cases | False Negatives (FN) | True Negatives (TN) | Total test negatives |
| Retreat cases | Retreat cases | ||
| c (FN) | d (TN) | c + d | |
| Total retreat cases | Total non-retreat cases | Total population | |
| a + c | b + d | a + b + c + d | |
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