Figure 1From: Physical activity level and its clinical correlates in chronic obstructive pulmonary disease: a cross-sectional studyPhysical activity level (PAL) presented across the airway obstruction classification from the Global Initiative for Chronic Obstructive Lung Disease (GOLD). Bars are the mean PALs (with 95% CI) in respective GOLD grades. * = p < 0.05, ns = p > 0.05.Back to article page