Comparison of FN Rates Using the 2 Reporting Schemes
| Traditional interpretation | Trinary interpretation | |||||||
| n per category | FN cases | FN rate | n per category | FN cases | FN rate | P (Fisher's 2-tailed test) | ||
| Low probability | 463 | 7 | 1.51% | PE negative | 585 | 9 (5 deep vein thrombosis, 4 PE) | 1.5% | 0.63 |
| Very low probability | 134 | 1 | 0.75% | |||||
| Normal | 104 | 0 | 0.0% | |||||
| Pooled normal, low probability, and very low probability | 701 | 8 (7 deep vein thrombosis, 1 PE) | 1.14% | |||||