Table 2.

Demographic data for hip resurfacing arthroplasty (HRA) and total hip arthroplasty (THA), which was used for reference

	HRA	reference THA
	n = 5,068	n = 6,485
Mean follow-up (range), years	6.8 (0.0–12.7)	7.9 (0.0–13.0)
Median follow-up, years	7.0	8.8
Mean age (range), years	54 (9–86)	64 (15–97)
Males, %	67	46
Implanting period	2001–2013	2001–2013
No. of hospitals	49	65
Diagnosis, % primary osteoarthritis	88	84