Determinants of bronchodilator responsiveness in forced vital capacity as % pre-bronchodilator value [%ΔFVCi] –results from univariate and multivariate analyses of whole cohort.

*Standard estimates allow comparison between variables with different units. It is the expected change in bronchodilator response per 1 SD increase in the variable. After multivariate correction for confounding variables the ‘most powerful’ effect on BDRFVC is doctor diagnosis of current-asthma, followed by age, gender, ever-smoking, and use of respiratory drugs(any medication for breathing including nasal decongestant). These values are adjusted for all corivariates including site and for the proportion of Caucasian population in each site.