Table 5.
Results of linear regression analysis to predict the changes in dyspnea
| Coefficient | SE | 95% CI | P value | |
|---|---|---|---|---|
| (A) Change in OCD (/year) | ||||
| Intercept |
-0.17 |
0.14 |
-0.45-0.12 |
0.25 |
| Change in FEV1 (ml/year) |
15.9 |
4.4 |
7.2-24.5 |
<0.001 |
| (B) Change in mMRC (/year) | ||||
| Intercept |
0.10 |
0.01 |
0.08-0.13 |
<0.001 |
| Change in FEV1 (ml/year) |
-1.55 |
0.35 |
-2.25-0.85 |
<0.001 |
| (C) Change in CRQ dyspnea (/year) | ||||
| Intercept |
-0.07 |
0.01 |
-0.09-0.05 |
<0.001 |
| Change in FEV1 (ml/year) |
1.17 |
0.26 |
0.66-1.68 |
<0.001 |
| (D) Change in SGRQ activity (/year) | ||||
| Intercept |
0.81 |
0.21 |
0.39-1.23 |
<0.001 |
| Change in FEV1 (ml/year) | -40.3 | 6.5 | -53.1-27.5 | <0.001 |
CI confidence interval, FEV1 forced expiratory volume in one second, OCD Oxygen Cost Diagram, mMRC modified Medical Research Council dyspnea scale, CRQ Chronic Respiratory Disease Questionnaire, SGRQ St. George’s Respiratory Questionnaire.