The proportion of participants with > @ % and @-mL increases from their baseline FEV ( @ ) with air - or heliox-driven bronchodilation was not different with respect to the proportion of participants with baseline FEV ( @ ) @ % ( @ vs. @ % , respectively ) and @ % > FEV ( @ ) > @ % ( @ vs. @ % , respectively ) , but it was significantly greater with heliox-driven bronchodilation in participants with FEV ( @ ) @ % ( @ vs. @ % , respectively ; p = @ ) .