Table 6.

 Adjusted hazard ratios from multivariable analysis of men undergoing hip arthroplasty, including those undergoing Birmingham hip resurfacing, with revision as endpoint

	Hazard ratio (95% CI)	P value
Surgery:
Birmingham hip resurfacing	—	—
Cemented	0.65 (0.54 to 0.79)	<0.001
Uncemented	1.04 (0.87 to 1.25)	0.657
Age (years)	1.00 (0.99 to 1.00)	0.091
ASA (American Society of Anesthesiologists) grade:
1	—	—
2	1.10 (0.97 to 1.24)	0.153
3	1.24 (1.04 to 1.48)	0.015
4	0.54 (0.20 to 1.45)	0.220
5*	—	—

*Not estimable because too few patients and events in this group