Table 1.

Multivariate analysis showing the effect of variables on development of OA on contralateral hip*

Variable	Hazard ratio	p value	95% CI
Participation in sports	0.892	0.527	0.626–1.271
Minimum joint space width (mm)	0.299	0.001	0.237–0.378
Center-edge angle (°)	0.941	0.001	0.915–0.968
Osteophyte	1.453	0.050	1.001–2.110
Head-to-neck ratio ≤ 1.3	1.555	0.015	1.088–2.223

* Time to shift from Charnley Class A to Charnley Class B was used as endpoint; OA = osteoarthritis.