Suppose the following table is the breakdown of chest pain and myocardial infarction in 400 patients who visited your clinic:
| Myocardial Infarction present (D+) | Myocardial Infarction absent (D-) | Total | |
| Chest pain present (T+) | 15 (TP) | 100 (FP) | 115 |
| Chest pain absent (T-) | 5 (FN) | 280 (TN) | 285 |
| Total | 20 | 380 | 400 |