MMP2 and MMP10 Polymorphisms Are Related to Steroid-Induced Osteonecrosis of the Femoral Head among Chinese Han Population

Table 1

Characteristics of the individuals in controls and steroid-induced ONFH patients.

Variables	Cases (n=286)	Controls (n=309)	p value
	N (%)	N (%)
Age, years
Mean ± SD	41.83 ± 13.12	48.78 ± 8.30	< 0.001
≤48	203 (71.0)	170 (55.0)
>48	83 (29.0)	139 (45.0)
Gender			0.412
female	113 (39.5)	112 (36.2)
male	173 (60.5)	197 (63.8)
Clinical stages
Stage II	64 (22.4)
Stage III	126 (44.1)
Stage IV	96 (33.6)
Hip lesions
Unilateral	83 (29.0)
Bilateral	203 (71.0)
Course, months
>12	157 (45.1)
≤12	129 (54.9)

P < 0.05 indicates statistical significance.
Independent samples t test.
Two-sided Chi-squared test.