Table 4.
Multiple regression analysis of background characteristics and the mediating effect of Critical Positivity Ratio on QoL.
| Step 1 Rsq=0.41 (CI 0.37–0.48#) |
Step 2 Rsq=0.60 (CI 0.56–0.71#) |
|
|---|---|---|
| Independent Variable | β | β |
| Dyspnea mMRC | −0.35** | −0.31** |
| SMAS-30 | 0.03** | 0.002 |
| Married | 0.17 | 0.19 |
| Age | 0.01* | 0.01 |
| Live alone | 0.13 | 0.04 |
| FEV1% | 0.004 | 0.005 |
| Hospitalized for COPD in past year | 0.18* | 0.14* |
| Clinical Positivity Ratio | Not in model | 0.61** |
Notes: mMRC = Modified Medical Research Council Dyspnea Scale; Critical Positivity Ratio = PANAS Positive/Negative affect. QoL = Quality of life; relationship examined through Chronic Respiratory Questionnaire total score.(#: confidence interval of the adjusted R square after 2000 bootstrapped models)