Analysis of the natural collapse course of non-traumatic osteonecrosis of the femoral head based on the matrix model

Table 4 Multivariate logistic regression analysis of risk factors

	B	SE	Wald	P value	OR	95% CI
Age	0.040	0.014	7.979	0.005^c**	1.041	1.012	1.070
ARCO staging
Stage I					1
Stage II	2.216	0.581	14.559	0.000 ^c***	9.175	2.939	28.645
JIC classification
Type A					1
Type B	0.855	0.861	0.986	0.321^c	2.35	0.435	12.699
Type C1	1.629	0.847	3.702	0.054^c	5.099	0.97	26.799
Type C2	2.229	0.903	6.088	0.014^c*	9.292	1.582	54.583
Area
< 30%					1
30–50%	−0.065	0.397	0.027	0.869^c	0.937	0.43	2.040
> 50%	1.465	0.653	5.032	0.025^c*	4.327	1.203	15.559
Matrix model
One point					1
Two point	2.638	1.067	6.115	0.013^c*	13.991	1.729	113.237
Four point	3.713	1.056	12.377	0.000 ^c***	40.993	5.179	324.470
Eight point	5.573	1.206	21.344	0.000 ^c***	263.180	24.744	2799.68

ARCO the Association Research Circulation Osseous, JIC Japanese Investigation Committee, OR odds ratio, CI confidence interval
*Significant difference (P < 0.05)
**Extremely marked difference (P < 0.01)
***Extremely marked difference (P < 0.001)
^cMultivariate logistic regression analysis

ISSN: 1749-799X