Fig. 9From: Prognostic risk factors for moderate-to-severe exacerbations in patients with chronic obstructive pulmonary disease: a systematic literature reviewDisease severity and BDR as risk factors for severe exacerbations. ACCP American College of Chest Physicians, ACOS Asthma-COPD overlap syndrome, ATSÂ American Thoracic Society, BDR bronchodilator reversibility, CI confidence interval, ERSÂ European Respiratory Society, ES effect size, FEV1 forced expiratory volume in 1Â s, FVCÂ forced vital capacity, GINA Global Initiative for Asthma, GOLD Global Initiative for Obstructive Lung DiseaseBack to article page