Relationships and differences between paper and electronic versions of the E-RS and CAT
| Spearman’s rank correlation coefficient | Intraclass correlation coefficient | P value from Wilcoxon-signed rank test | |
| E-RS total score | 0.76 (p<0.001) | 0.82 (p<0.001) | <0.001 |
| RS-breathlessness | 0.79 (p<0.001) | 0.79 (p<0.001) | 0.0066 |
| RS-cough and sputum | 0.67 (p<0.001) | 0.71 (p<0.001) | 0.012 |
| RS-chest symptoms | 0.66 (p<0.001) | 0.75 (p<0.001) | 0.0036 |
| CAT score | 0.84 (p<0.001) | 0.89 (p<0.001) | <0.001 |
CAT, the COPD Assessment Test; E-RS, the Evaluating Respiratory Symptoms in COPD.