Figure 1: Urine concentrations of a-hydroxysalmeterol (ngmL-1) in asthmatics and non-asthmatics, 4 (T4), 8 (T8) and 12 hours (T12) after administration of 100 g inhaled salmeterol (median interquartile range). *Significant difference (p=0.01) between asthmatics and non-asthmatics. #Significant different from T12 (p<0.05).