Evaluating the FEV/FVC ratio in the lower range of normality as a marker of worse clinical outcomes in asthmatic subjects without airway obstruction.

Background: We should continually improve tools for evaluating asthma. The aim of this study was to evaluate whether the FEV/FVC ratio in the lower range of normality is associated with worse outcomes in asthmatics without airway obstruction.

Methods: We screened asthmatics at eight clinics.