Table 2.
Correlation coefficients between the changes in different dyspnea measurements
| OCD (/year) | mMRC (/year) | CRQ dyspnea (/year) | SGRQ activity (/year) | Borg score (/year) | |
|---|---|---|---|---|---|
| OCD (/year) |
1 |
|
|
|
|
| mMRC (/year) |
-0.51* |
1 |
|
|
|
| CRQ dyspnea (/year) |
0.45* |
-0.49* |
1 |
|
|
| SGRQ activity (/year) |
-0.52* |
0.52* |
-0.52* |
1 |
|
| Borg score (/year) | -0.06 | 0.04 | -0.10 | 0.02 | 1 |
* p < 0.001. OCD Oxygen Cost Diagram, mMRC modified Medical Research Council dyspnea scale, CRQ Chronic Respiratory Disease Questionnaire, SGRQ St. George’s Respiratory Questionnaire.