TABLE III.

Results of Cox Regression Analysis of Risk of Any Revision by Bearing Combination

Characteristic	HR (95% CI)
	All Ages	<55 Years of Age
Age
55 to <65 yr	0.85 (0.79, 0.91)
65 to <75 yr	0.73 (0.68, 0.79)
≥75 yr	0.68 (0.62, 0.73)
<55 yr	1.0 (reference)
Sex
Male	1.18 (1.13, 1.23)	1.20 (1.08, 1.34)
Female	1.0 (reference)	1.0 (reference)
Bearing combination
CoC	0.77 (0.72, 0.82)	0.64 (0.52, 0.78)
CoP	0.74 (0.66, 0.82)	0.50 (0.36, 0.70)
CoXLPE	0.66 (0.60, 0.72)	0.61 (0.47, 0.78)
MoXLPE	0.81 (0.76, 0.87)	0.77 (0.59, 1.01)
CMoXLPE	0.58 (0.48, 0.71)	0.47 (0.30, 0.76)
MoP	1.0 (reference)	1.0 (reference)
Stem fixation
Cementless	1.35 (1.28, 1.42)	1.45 (1.26, 1.68)
Cemented	1.0 (reference)	1.0 (reference)