Table 1.

Demographic data for ONFH patients and healthy controls

	ONFH patients (n = 102)	Healthy controls (n = 97)	P value
Age (Y)	45.45 ± 10.15	43.21 ± 9.49	0.109
Sex (F/M)	60/42	56/41	0.876
BMI (kg/m2)	24.15 ± 3.38	23.79 ± 2.80	0.411
Disease duration (M)	29(3–136)	/
VAS scores	4.79 ± 2.08	/
HHS scores	61.93 ± 16.77	/
FICAT stage (1/2/3/4)	13/24/33/32	/
alcohol/Steroid/idiopathic (n)	41/26/35	/
MMP-9 level (ng/ml)	1073.26 ± 564.34	587.84 ± 295.70	< 0.05
TIMP-1level (ng/ml)	186.52 ± 71.87	207.81 ± 85.34	0.058
MMP-9/TIMP ratio	7.17 ± 6.71	3.07 ± 1.48	< 0.05

All data are given as the mean value ± SD or median