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Figure 2 | Respiratory Research

Figure 2

From: Inflammation in sputum relates to progression of disease in subjects with COPD: a prospective descriptive study

Figure 2

Distribution of patients according to GOLD staging category at baseline (open histograms) and at follow-up, four years later (grey histograms). There was a significant redistribution in the disease stage towards more severe disease over the study period. The significance (p) is shown for the Wilcoxon signed rank test. The figures in brackets indicate the number of subjects within each group that contributed to data relating to sputum inflammation.

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