Table 3. Stratified prevalence of airflow obstruction and frequencies of risk factors according to the GOLD criteria.

Values are presented as %.

GOLD, Global Initiative for Chronic Obstructive Lung Disease; FEV₁, forced expiratory volume in one second; FVC, forced vital capacity.

^*GOLD 1, FEV₁/FVC<0.70 and FEV₁≥80% of the predicted value; GOLD 2, FEV₁/FVC<0.70 and FEV₁ 50%-80%; GOLD 3, FEV₁/FVC<0.70 and FEV₁ 30%-50%; GOLD 4, FEV₁/FVC<0.70 and FEV₁<30%. ^†Prevalence was calculated among 8,969 persons with valid spirometry data. ^‡Includes former and current smokers.