Fig. 2
From: Accelerated extracellular matrix turnover during exacerbations of COPD
Ratios between collagen degradation and formation at time of exacerbation and at 4 weeks follow-up. Degradation/formation ratio of a collagen type III calculated by serum C3M/Pro-C3, b collagen type IV calculated by serum C4M/P4NP 7S, and c collagen type VI calculated by plasma C6M/Pro-C6. Results are shown as geometric mean with 95 % confidence intervals. Ratios at exacerbation and follow-up were compared using paired t-test. Significance levels: ***P <0.001, ****P <0.0001