Charlson comorbidity index in asthma–COPD overlap studies
| Asthma | COPD | Overlap | p Value | |
|---|---|---|---|---|
| Fu et al17 | 3.1±1.2 | 3.8±0.9 | 3.8±1.1 | >0.05 |
| Miravitlles et al 5 | – | 0.89±1.07 | 1.44±0.78 | <0.001 |
| Menezes et al 7 | 1.2±1.1 | 0.9±0.9 | 0.9±1.0 | 0.079 |
| McDonald et al 16 | 3.6±1.2 | 4.2±0.8 | 3.6±1.1* | <0.04 |
| Blanchette et al 14 | – | 2.3±2.3 | 2.6±2.1 | <0.001 |
| Rhee et al 15 | – | – | Comorbidities increased compared with COPD | <0.02 |
*COPD vs overlap.