Table 3. Protein expression levels of MMP-9 and its complexes in AVMs and normal tissues.

Protein	sample	Mean ± SD	Min Value	Max Value	Median	P value
Total MMP-9	AVM	0.449 ± 0.363	0.170	0.446	0.381	P < 0.05
	Normal	0.075 ± 0.052	0.000	0.161	0.066
MMP-9 monomer	AVM	0.194 ± 0.168	0.025	0.497	0.112	P < 0.05
	Normal	0.014 ± 0.008	0.000	0.024	0.013
MMP-9/NGAL	AVM	0.095 ± 0.089	0.031	0.253	0.050	P < 0.05
	Normal	0.011 ± 0.016	0.000	0.048	0.005
MMP-9/TIMP-1	AVM	0.114 ± 0.072	0.032	0.262	0.090	P < 0.05
	Normal	0.050 ± 0.039	0.000	0.095	0.046