Fig. 2From: Environmental triggers of COPD symptoms: a cross sectional surveySelf-reported symptom triggers. Prevalence ratios for severe/very severe versus mild/moderate COPD* .*Mild/Moderate: COPD diagnosis normal FEV/FVC Ratios and Gold Stages 1, 2; Severe/Very Severe COPD includes Gold Stages 3 and 4. Error bars represent 95Â % confidence intervalsBack to article page