| Index | FEV1 | BODE | e-BODE | BODEx | ADO | SAFE | DOSE |
| FEV1 | 1.0000000 | 0.7277113 | -0.7038642 | -0.7653869 | -0.6633867 | -0.5998811 | -0.6443202 |
| BODE | 1.0000000 | 0.9683475 | 0.8886048 | 0.7887521 | 0.8173834 | 0.8495256 | |
| e-BODE | 1.0000000 | 0.9333513 | 0.7734677 | 0.8289571 | 0.8740556 | ||
| BODEx | 1.0000000 | 0.7666853 | 0.7420591 | 0.9295135 | |||
| ADO | 1.0000000 | 0.6216816 | 0.7366796 | ||||
| SAFE | 1.0000000 | 0.7379466 | |||||
| DOSE | 1.0000000 |
BODE: body mass index, airflow obstruction, dyspnoea, exercise capacity; e-BODE: BODE plus exacerbations; BODEx: substitution of exacerbations for exercise capacity as measured by incremental exercise test; ADO: age, dyspnoea and forced expiratory volume in 1 s (FEV1); SAFE: quality of life by St George’s Respiratory Questionnaire, FEV1 and 6-min walking distance; DOSE: dyspnoea, smoking status, FEV1 and prior exacerbation history.