Age (years) | Neutrophils (cells/ml) | NE activity (μm/ml) | MMP-9 (ng/ml) | FEV1 (% predicted) | |
Glycosaminoglycans (μg/ml) | r = 0.62, p<0.001 (0.40 to 0.80) | r = 0.85, p<0.001 (0.73 to 0.92) | r = 0.77, p<0.001 (0.59 to 0.87) | r = 0.77, p<0.001 (0.59 to 0.87) | r = −0.32, ns (−0.60 to 0.25) |
Elastin (μg/ml) | r = 0.40, p<0.05 (0.03 to 0.63) | r = 0.82, p<0.001 (0.63 to 0.90) | r = 0.72, p<0.001 (0.49 to 0.85) | r = 0.59, p<0.001 (0.29 to 0.76) | r = −0.45, p<0.05 (−0.74 to −0.01) |
Collagen (μg/ml) | r = 0.45, p<0.01 (0.13 to 0.71) | r = 0.75, p<0.001 (0.52 to 0.88) | r = 0.75, p<0.001 (0.57 to 0.89) | r = 0.74, p<0.001 (0.46 to 0.85) | r = −0.18, ns (−0.55 to 0.35) |
Spearman rank correlations shown with 95% confidence intervals; ns, not significant.