RESULTS	The differences after 2 weeks compared with placebo were 16 l/min ( 95 % confidence interval ( CI ) 11 to 21 ) , 11 l/min ( 95 % CI 6 to 16 ) , and 27 l/min ( 95 % CI 22 to 33 ) for salmeterol , fluticasone propionate , and the salmeterol/fluticasone propionate combination , respectively .\