Table 2. Expression of MMP9, TIMP1 and PPAR-γ of COPD patients with different pulmonary functional impairment.

Analyte	Group I	Group II	Group III	Group IV	F	P
PPAR-γ (ng/L)	132.64±20.42	128.62±23.62	119.11±21.93	103.68±27.87	3.28	0.045
TIMP1 (U/L)	107.85±17.25	99.51±16.63	86.84±14.53	82.15±8.40	6.22	0.004
MMP9 (μg/L)	16.83±3.34	17.16±4.55	17.49±8.67	25.55±9.87	3.69	0.031
MMP9/TIMP1	0.13±0.05	0.18±0.07	0.21±0.13	0.31±0.13	3.78	0.29