| Low Probability VQ scan n(%) | Intermediate Probability VQ scan n(%) | High Probability VQ scan n(%) | Total n(%) | |
| Low clinical probability | 62(96.9%) | 2(3.1%) | 0(0.0%) | 64(100.0%)a |
| Moderate clinical probability | 46(93.9%) | 0(0.0%) | 3(6.1%) | 49(100.0%) |
| High clinical probability | 10(76.9%) | 1(7.7%) | 2(15.4%) | 13(100.0%) |