Table II.
Role of chronic obstructive pulmonary disease (COPD) grade on the various component scores and total score of St. George’s Respiratory Questionnaire for COPD: Results of regression and multiple regression analysis
| COPD grade | Symptom component score | Activity component score | Impact component score | Total score | ||||
|---|---|---|---|---|---|---|---|---|
|
|
|
|
|
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| Partial β* (95% CI) | P | Partial β* (95% CI) | P | Partial β* (95% CI) | P | Partial β* (95% CI) | P | |
| 1 | Ref | - | Ref | - | Ref | - | Ref | - |
| 2 | 11.8 (1.8-21.8) | 0.021 | 4.5 (−4.5-13.4) | 0.323 | 7.6 (−0.4-15.5) | 0.062 | 7.4 (0.6-14.1) | 0.032 |
| 3 | 23.4 (11.8-34.9) | <0.001 | 8.72 (−1.6-19.1) | 0.098 | 20.6 (11.3-29.8) | <0.001 | 17.4 (9.6-25.2) | <0.001 |
| 4 | 36.8 (24.6-49.0) | <0.001 | 22.6 (11.7-33.5) | <0.001 | 30.6 (20.8-40.3) | <0.001 | 29.2 (21.0-37.5) | <0.001 |
| R2 (%) | 40.7 | 30.5 | 48.5 | 53.0 | ||||
*Adjusted for gender and age. Ref, reference category; β, regression coefficient; R2, multiple correlation coefficient; CI, confidence interval