Table 3. Positive and negative predictive values for low and high clinical probabilities according to Wells’ Criteria and the Revised Geneva Score .
| Wells’ Criteria |
CT Positive (N) |
CT Negative (N) |
Total (N) |
RevisedGeneva |
CT Positive (N) |
CT Negative (N) |
Total (N) |
| Low | 7 | 31 | 38 | Low | 20 | 45 | 65 |
| High | 9 | 2 | 11 | High | 8 | 3 | 11 |
| Total | 16 | 33 | 49 | Total | 28 | 48 | 76 |
| Positive predictive value for low | 18.4 % | Positive predictive value for low | 30.8% | ||||
| Positive predictive value for high | 81.8 % | Positive predictive value for high | 72.7% | ||||
| Negative predictive value for low | 81.6 % | Negative predictive value for low | 69.2% | ||||
| Negative predictive value for high | 18.2 % | Negative predictive value for high | 27.3% | ||||