Prevalence of Chronic Obstructive Pulmonary Disease in the Portuguese Population

Exclusion Criteria

• •Any condition that makes it impossible to perform spirometry, in accordance with standards of the joint American Thoracic Society/European Respiratory Society, and as described in the "Contraindications for spirometry testing" section of the Study Procedures Manual;
• •Any condition that makes it impossible to perform the bronchodilation, as described in the "Contraindications for bronchodilation" section of the Study Procedures Manual;
• •Severe cognitive disability that may interfere with the person's capability to participate in the study.