RESULTS	Mean improvement in trough FEV ( 1 ) over 12 weeks was significantly greater with all 3 arformoterol doses ( 15 microg BID , +16.9 % ; 25 microg BID , +18.9 % ; 50 microg QD , +14.9 % ) and for salmeterol ( +17.4 % ) relative to placebo ( +6.0 % ; P < 0.001 ) .\