Table 4.

Variables that increased/decreased the probability of severe bone defects

Bone defect	Variable	Odds ratio	95% confidence interval		p value	R2
			Lower bound	Upper bound
Acetabulum Saleh type IV, V	Wear rate > 0.2 mm/year	4.146	1.222	14.066	0.023	0.155a
	Increasing patient’s height by 1 cm	0.898	0.837	0.963	0.002
	Wear rate > 200 mm3/year	5.782	1.846	18.110	0.003	0.191b
	Increasing patient’s height by 1 cm	0.905	0.841	0.973	0.007
Femur Saleh type III	Wear rate > 0.2 mm/year	5.862	1.584	21.699	0.008	0.141a
	Higher position of the cup	3.688	1.391	9.781	0.009
	Wear rate > 200 mm3/year	3.479	1.279	9.465	0.015	0.173b
	Cup above the true acetabulum	3.292	1.153	9.397	0.026

R² Nagelkerke R square

^aModel with linear wear rate data inclusion

^bModel with volumetric wear rate data inclusion