Asthmatic Patients with Documented Asthma Medication Prescription in Preceding Year, Compared with Nonasthmatic Patients
| Group | Negative | Nondiagnostic | P | Positive | P | Repeat exam after negative | P | False-negative | P |
| VQ | |||||||||
| Asthma with medication (n = 1,666) | 1,511 (90.7%) | 60 (3.6%) | 0.689 | 95 (5.7%) | 0.072 | 27 (1.8%) | 0.634 | 4/1430 (0.3%) | 0.015 |
| Nonasthma (n = 8,672) | 7,746 (89.3%) | 330 (3.8%) | 596 (6.9%) | 163 (2.1%) | 57/6273 (0.9%) | ||||
| CTPA | |||||||||
| Asthma with medication (n = 960) | 833 (86.8%) | 15 (1.6%) | 0.932 | 112 (11.7%) | <0.001 | 6 (0.7%) | 0.944 | 18/716 (2.5%) | 0.063 |
| Nonasthma (n = 6,225) | 5,118 (82.2%) | 95 (1.5%) | 1,012 (16.3%) | 33 (0.6%) | 59/3838 (1.5%) |