Figure 5From: Inflammation in sputum relates to progression of disease in subjects with COPD: a prospective descriptive studyIndividual data (excluding subjects with mild bronchiectasis) indicating the relationship between baseline sputum IL-8 concentration and emphysema progression in the upper lung region (voxel index at a threshold -950HU). Spearman's correlation coefficient (r) and its significance (p) are indicated.Back to article page