Figure 3From: MMP-9, TIMP-1 and inflammatory cells in sputum from COPD patients during exacerbationMolar ratio between MMP-9 and TIMP-1 in COPD sputum. The data from figure 2 was used to calculate a molar ratio between MMP-9 and TIMP-1. Median values are marked as diamonds. Data were statistically analysed by a non parametric Wilcoxon signed rank test.Back to article page