Chronic obstructive pulmonary disease (COPD) prevalence (postbronchodilator FEV1/FVC (forced expiratory volume in 1 s/forced vital capacity) <0.70) and GOLD (Global Initiative for Chronic Obstructive Lung Disease) severity stages by gender and age group. Chronic obstructive pulmonary disease (COPD) prevalence (postbronchodilator FEV1/FVC (forced expiratory volume in 1 s/forced vital capacity) <0.70) and GOLD (Global Initiative for Chronic Obstructive Lung Disease) severity stages by gender and age group. M, men; W, women; T, total. M Miravitlles et al. Thorax 2009;64:863-868 Copyright © BMJ Publishing Group Ltd & British Thoracic Society. All rights reserved.