Table 7.

The same type of analysis as in Table 6 except that femoral head diameter (categorized as ≤ 44 mm, 45–49 mm, 50–54 mm, and ≥ 55 mm) has been added, resulting in 4,401 resurfacings (159 revisions) available for analysis ^a

	RR	95% CI	p-value
BHR (reference)	1	–
ASR	1.73	1.14–2.61	0.01
Female / Male	1.87	1.19–2.92	0.006
Age (< 55 / ≥ 55 years)	1.00	0.72–1.38	1.0
Femoral head diameter
≤ 44 mm (reference)	1	–
45–49 mm	0.89	0.41–1.94	0.8
50–54 mm	0.75	0.40–1.41	0.4
≥ 55 mm	0.65	0.38–1.12	0.1

^a Only the results for BHR, ASR, age, sex, and femoral head diameter are given to make the table easier to read.