Levalbuterol significantly improved the least square mean peak percent change in FEV ( 1 ) compared with placebo ( levalbuterol 25.6 % + / - 1.3 % [ p < 0.001 ] ; racemic albuterol 21.8 % + / - 1.8 % [ p = ns ] ; placebo 16.8 % + / - 1.9 % ) .
