Fig. 1
From: Decreased COPD prevalence in Sweden after decades of decrease in smoking
Prevalence of a CAO and COPD and b CAO GOLD ≥ 2 and COPD GOLD ≥ 2 by age and packyears of smoking. CAO = post-BD FEV1/FVC < 0.7, COPD = CAO in combination with respiratory symptoms