	Asthma Non-smoker	Asthma Smoker	Control Non-smoker	Control Smoker
MMP-9/TIMP1	1.6 (0.7,2.2)	1.0 (0.5,1.8)	1.3 (0.8,2.4)	1.0 (0.5,2.4)
MMP-9/TIMP2	9.0 (6.0,11.6)	7.5 (3.8,11.4)	6.8 (4.3,11.2)	6.5 (4.3,11.2)
MMP-9 activity/TIMP1	0.4 (0.3,0.6)	0.2 (0.1,0.4)*	0.7 (0.3,1.3)	0.3 (0.1,0.5)*
MMP-9 activity/TIMP2	2.6 (2.0,3.1)	1.4 (0.9,2.3)**	3.1 (2.1,5.0)	1.7 (1.1,3.0)*

Median (IQR); *=p<0.05, **p=0.001 smokers vs nonsmokers in each group