Table 2.

Multivariate analysis showing the effect of variables with CE of 25^o or less*

Variable	Hazard ratio	p value	95% CI
Participation in sports	0.630	0.251	0.287–1.385
Minimum joint space width (mm)	0.371	0.001	0.226–0.609
Osteophyte	1.263	0.575	0.559–2.850
Head-to-neck ratio ≤ 1.3	0.889	0.768	0.408–1.937

^*Time to shift from Charnley Class A to Charnley Class B was used as endpoint; CE = center edge.