Dataset from Spiriva® Assessment of FEV1 (SAFE). The Effect of Inhaled Tiotropium Bromide (18 Mcg Once Daily) on the Change in FEV1 During Long-term Treatment in Patients With COPD. A One-year Parallel Group, Double-blind, Randomised, Placebo-controlled Study

The objective of this trial is to evaluate whether the effect of one year (48 weeks) treatment with inhaled tiotropium bromide (Spiriva® - 18 µg once daily) on the change in trough FEV1, compared to placebo in patients with COPD, is affected by smoking status.