2. All patients must have a diagnosis of COPD and must meet the following spirometric criteria: Patients must have relatively stable airway obstruction with a post-bronchodilator forced expiratory volume in one second (FEV1) ≥ 30 % of predicted normal and < 80% of predicted normal and a post-bronchodilator FEV1 / forced vital capacity (FVC) < 70% at Visit 1