Patient Characteristics and Exam Settings by Modality and Presence or Absence of Asthma
| Characteristic | All (n = 19,412) | VQ group (n = 11,598) | CTPA group (n = 7,814) | P | Asthmatic (n = 4,515) | Nonasthmatic (n = 14,897) | P |
| Age (y) | 52 ± 18 | 50 ± 18 | 56 ± 18 | <0.001 | 51 ± 17 | 52 ± 19 | <0.001 |
| Sex (female) | 70% | 73% | 65% | <0.001 | 80% | 67% | <0.001 |
| CCI | 1.5 ± 2.6 | 1.2 ± 2.3 | 2.0 ± 2.9 | <0.001 | 2.0 ± 2.6 | 1.4 ± 2.5 | <0.001 |
| Exam setting | <0.001 | <0.001 | |||||
| Emergency department | 60% | 66% | 51% | 61% | 60% | ||
| Inpatient | 30% | 23% | 42% | 32% | 30% | ||
| Outpatient | 4% | 5% | 2% | 5% | 4% | ||
| Unavailable | 5% | 6% | 5% | 2% | 6% |
CCI = Charlson Comorbidity Index.