Figure 2From: MMP-9, TIMP-1 and inflammatory cells in sputum from COPD patients during exacerbationMMP-9 and TIMP-1 levels in sputum from COPD patients. Samples were taken from patients prior to and during exacerbation (n = 12). MMP-9 was measured by gelatin zymography and TIMP-1 was measured by ELISA and corrected for weight of sputum. Individuals are shown as open circles and median values as diamonds. Data were analysed by non parametric Wilcoxon signed rank test.Back to article page