Patients With Low Scores on Both Rules, With and Without a Negative D-Dimer Result, and (Missed) Thromboembolic Events
| Wells Rule (N=1,002) | Primary Care Rule (N=1,002) | |||
|---|---|---|---|---|
| Outcome | No. (%) | 95% CI | No. (%) | 95% CI |
| CDR=clinical decision rule; CI=confidence interval; D-dimer = dimerized plasmin fragment D; VTE = venous thromboembolism (deep vein thrombosis or pulmonary embolism). | ||||
| Low CDR score without D-dimer | 629 (63) | 60–66 | 850 (85) | 83–87 |
| Low CDR score and D-dimer negative | 447 (45) | 42–48 | 495 (49) | 47–54 |
| VTE in patients with low score and D-dimer negative | 7 (1.6) | 0.4–2.7 | 7 (1.4) | 0.6–2.9 |