Table 3. Characteristics of DSAs Within Each HHI Level.

DSA Characteristic	HHI Level				Comparison of HHI Levels: P Value
	No Competition (17 DSAs)	Low Competition (12 DSAs)	Mid Competition (12 DSAs)	High Competition (6 DSAs)	No Versus Low	No Versus Mid	No Versus High	Low Versus Mid	Low Versus High	Mid Versus High
HHI	1.00 (1.00-1.00)	0.64 (0.56-0.75)	0.50 (0.46-0.51)	0.27 (0.21-0.36)	<0.001	<0.001	<0.001	<0.001	0.004	0.004
Transplant centers per DSA	1 (1-1)	2 (2-2)	3 (2-4)	6 (5-6)	<0.001	<0.001	<0.001	0.15	0.003	0.02
Liver transplants: 2003-2009	355 (158-588)	778 (501-1157)	818 (593-1142)	1573 (1197-1739)	0.10	0.002	0.002	0.55	0.03	0.03
Liver transplants per year: 2007-2009	55 (28-84)	112 (65-168)	130 (93-189)	227 (182-235)	0.009	0.001	0.002	0.38	0.02	0.04
Liver transplants per year per million*	14 (11-20)	18 (16-27)	20 (17-26)	19 (18-20)	0.10	0.04	0.23	0.69	0.89	0.52
New listings for liver transplantation: 2003-2009	573 (283-792)	1318 (882-1860)	1481 (1132-1796)	3414 (3048-4171)	0.002	<0.001	0.002	0.48	0.004	0.01
New listings for liver transplantation per year: 2007-2009	86 (44-118)	186 (103-249)	226 (166-268)	575 (422-588)	0.004	<0.001	0.002	0.31	0.005	0.01
New listings for liver transplantation per year per million*	18 (16-28)	34 (26-44)	37 (30-43)	45 (35-52)	0.02	0.005	0.0075	0.78	0.18	0.19

Note: The data are presented as medians and Interquartile ranges.

^*Liver transplants and new listings for liver transplantation were estimated as the mean for calendar years 2007 to 2009. Estimates were adjusted with 2008 census data.