Table 1.

Number of uniquely owned facilities per hospital service area and change in number of uniquely owned facilities per hospital service area stratified by consolidation

No. of Uniquely Owned Facilities per HSA	HSAs That Consolidated,a % of HSAs			HSAs That Did Not Consolidate,a % of HSAs			All HSAs Combined,% of HSAs
	2001	2011	Difference	2001	2011	Difference	2001	2011	Difference
0	43.7	33.0	−10.8	43.8	33.3	−10.5	43.8	33.1	−10.6
1	38.1	46.5	8.4	41.9	34.4	−7.5	40.0	40.5	0.5
2	11.4	12.8	1.4	9.6	21.1	11.5	10.5	17.0	6.4
3	2.6	3.4	0.7	2.8	5.9	3.1	2.7	4.6	1.9
4	1.4	1.4	0.0	0.9	2.0	1.1	1.2	1.7	0.6
5	0.7	0.7	0.0	0.4	1.3	0.9	0.6	1.0	0.5
6	0.5	0.6	0.1	0.3	0.7	0.4	0.4	0.6	0.3
7	0.1	0.3	0.2	0.1	0.5	0.4	0.1	0.4	0.3
8	0.2	0.3	0.1	0.2	0.1	−0.1	0.2	0.2	0.0
>8	1.2	1.0	−0.2	0.1	0.8	0.6	0.6	0.9	0.2
Sum	100	100		100	100		100	100

Note that the table includes all HSAs where patients live in each year. HSAs where patients live but where no dialysis facilities exist have zero uniquely owned facilities in that HSA. Data are not weighted according to the number of patients who live in each HSA. HSA, hospital service area.

^aConsolidation is defined as a hospital service area where the Herfindahl–Hirschman Index increased between 2001 and 2011; 50% of patients lived in HSAs that consolidated.