Compared to placebo what was the result of tiotropium 18 μg once daily, salmeterol, 50 μg on Forced Expiratory Volume in the first second (FEV1)?
After 169 days of treatment, the mean ± SE improvement above placebo in trough FEV1 was 110 ± 20 mL for tiotropium (p < 0.001) and 80 ± 20 mL for salmeterol (p < 0.001) (Table 3a).