Table 2.

Relative Variation Within-Hospital Referral Region versus Between-Hospital Referral Region

HRR	Mean	2.5%	Median	97.5%
Atlanta, GAa	0.156	0.004	0.109	0.558
Augusta, GAa	0.291	0.008	0.211	1.024
Savannah, GAa	0.190	0.005	0.135	0.656
Asheville, NC	0.643	0.015	0.427	2.466
Charlotte, NC	0.635	0.015	0.404	2.627
Durham, NC	0.634	0.015	0.417	2.528
Greensboro, NC	0.288	0.008	0.216	0.988
Greenville, NC	0.705	0.017	0.441	2.865
Hickory, NC	0.261	0.008	0.194	0.902
Raleigh, NC	0.562	0.013	0.367	2.258
Wilmington, NC	0.354	0.010	0.251	1.301
Winston-Salem, NC	0.537	0.013	0.359	2.157
Charleston, SC	0.428	0.011	0.288	1.653
Columbia, SC	0.687	0.016	0.430	2.785
Florence, SC	0.407	0.011	0.276	1.571
Greenville, SC	0.361	0.010	0.251	1.399
Spartanburg, SC	0.307	0.008	0.219	1.121
Johnson City, TNa	0.122	0.003	0.084	0.453
Norfolk, VAa	0.401	0.011	0.276	1.514

For each posterior draw, we calculated the weighted SD of the estimated county effects within each HRR, where the weights are the proportion of the county population within the HRR. The relative variation is the ratio of within-HRR variation to the between-HRR variation, and higher values indicate that county explains a greater amount of variation than lower values.

^aData for HRRs extending into Georgia (3), Tennesee (1), and Virginia (1) are truncated at the borders of North and South Carolina.

HRR, hospital referral region.