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. Author manuscript; available in PMC: 2020 Jan 23.
Published in final edited form as: Ann Emerg Med. 2018 Mar 29;72(2):147–155. doi: 10.1016/j.annemergmed.2018.02.018

Table 3.

Referral hospital accessibility analysis.

Pittsburgh Atlas
(n=326)		 Dartmouth Atlas
(n=306)		 Difference
(95% CI)
No high-volume acute myocardial infarction hospitals
 Number of regions (%) 21 (6.4) 6 (2.0) 4.4 (7.6–0)*
 Population at risk, n 3,632,673 1,451,098
 Localization index, median (IQR) 73.4 (39.4–79.0) 75.0 (57.5–89.4)
No high-volume stroke hospitals
 Number of regions (%) 168 (51.5) 125 (40.8) 10.7 (18.4–0)*
 Population at risk, n 60,955,347 57,116,929
 Localization index, median (IQR) 78.7 (72.2–86.0) 83.9 (79.3–88.1)
No Level I or II trauma centers
 Number of regions (%) 134 (41.1) 83 (27.1) 14.0 (21.3–0.1)*
 Population at risk, n 42,542,356 17,729,481
 Localization index, median (IQR) 63.8 (45.3–77.0) 70.1 (56.2–84.3)
*

P<.05.