| Spearman's rank correlation coefficients | Pearson's correlation coefficient | ||
---|---|---|---|---|
 | Rs | p value | R | p value |
Dyspnea vs. Airflow limitation | Â | Â | Â | Â |
BDI score vs. FEV1 (L) | 0.60 | < 0.0001 | 0.60 | < 0.0001 |
BDI score vs. FEV1 (%pred) | 0.56 | < 0.0001 | 0.57 | < 0.0001 |
BDI score vs. FEV1/FVC | 0.56 | < 0.0001 | 0.57 | < 0.0001 |
Dyspnea vs. Static Hyperinflation | Â | Â | Â | Â |
BDI score vs. IC (L) | 0.45 | < 0.0001 | 0.48 | < 0.0001 |
BDI score vs. IC/predicted TLC | 0.46 | < 0.0001 | 0.51 | < 0.0001 |
BDI score vs. IC/TLC | 0.47 | < 0.0001 | 0.48 | < 0.0001 |