Table 3.

Characteristics of dominant and dominated providers (in 2011/2012)

	Dominant (J=5)			Dominated (J=8)
Description	M e a n	S D		M e a n	S D
Annual volume of hip replacements	361.60	198.16		365.38	190.04
Ownership (1 = private, 0 = NHS)	1.00	‐		0.00	‐
Herfindahl–Hirschman Index	0.60	0.05		0.78	0.07
HRG specialisation	0.73	0.13		0.15	0.03

Abbreviation: NHS = National Health Service; HRG = healthcare resource group.