Fig. 1From: Lung hyperinflation and functional exercise capacity in patients with COPD – a three-year longitudinal studyEstimated mean 6-min walk distance (6MWD) by quartiles of inspiratory-to-total lung capacity (IC/TLC) ratio at baseline and during 3 years of follow-up. IC/TLC ratio at baseline was divided into approximate quartiles. IC/TLC ratio and the interaction term with time was included in an unadjusted generalized estimating equations regression analysesBack to article page