Multiple regression analysis of perception of bronchoconstriction (indicated by the slope in the linear regression analysis between the change in VAS value and the reduction in FEV1 as percentage of baseline value) according to baseline FEV1, hyperresponsiveness (2log PC20), baseline VAS, age, and sex
| Regression coefficient | Individual R2 | p value | |
|---|---|---|---|
| Intercept | 0.37 | 0.179 | |
| Baseline FEV1(l) | 0.20 | 0.07 | 0.018 |
| Hyperresponsiveness (2log PC20) | 0.10 | 0.10 | 0.002 |
| Baseline VAS value (mm) | 0.04 | 0.00 | 0.652 |
| Age (years) | 0.03 | 0.00 | 0.777 |
| Male (0) female (1) | −0.01 | 0.01 | 0.870 |
R2 of the total model = 0.14.
Regression model: perception of bronchoconstriction = 0.37 + 0.10 × 2log PC20 + 0.20 × FEV1 (l).