Research Article
Pulmonary Embolism in Pneumonia: Still a Diagnostic Challenge? Results of a Case-Control Study in 100 Patients
Table 4
Evaluating the diagnostic value of D-dimer using a known threshold.
| (a) |
| | D-dimer results on PE | CTA results on PE | | Presence | Absence |
| | Positive | 44 (TP) | 40 (FP) | | Negative | 1 (FN) | 5 (TN) |
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| (b) |
| | Measure | Proportion | Asymptotic 95% CI | Exact 95% CI |
| | Sensitivity | 97.78% | 93.47%–100% | 88.23%–99.94% | | Specificity | 11.11% | 1.93%–20.29% | 3.71%–24.05% | | PPV | 52.38% | 41.70%–63.06% | 41.19%–63.40% | | NPV | 83.33% | 53.51%–100% | 35.88%–99.58% | | Accuracy | 54.44% | 44.16%–64.73% | 43.60%–64.98% |
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PE: pulmonary embolism; CTA: computed tomography angiography; TP: true positive; FP: false positive; FN: false negative; TN: true negative, CI: confidence interval; PPV: positive predictive value; NPV: negative predictive value.
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