Table 3.

Characteristics of the 28 trauma centers in the study by tertile of mean annual EDT volume.

	Low (1-2) n = 10	Tertile of mean annual EDT volume Middle (2.2-3.4) n = 9	High (3.7-51.1) n = 9	p
Trauma Center Level				0.03
I	3 (30%)	4 (44%)	8 (89%)
II	7 (70%)	5 (56%)	1 (11%)
Annual Trauma Volume	756 (IQR 559-960)	1096 (IQR 907-1159)	1278 (IQR 1075-1328)	0.09
Mechanism of Injury
Gunshot wound	4.2% (IQR 3.2%-5.5%)	5.3% (IQR 5.1%-6.0%)	9.6% (IQR 7.2%-16.7%)	0.01
Blunt mechanism	94.0% (IQR 93.1%-94.6%)	92.3% (IQR 91.0%-92.8%)	87.6% (IQR 79.4%-89.9%)	0.01
Stab wound	1.9% (IQR 1.5%-2.4%)	2.3% (IQR 2.0%-2.8%)	2.9% (IQR 2.7%-4.8%)	0.02
Annual Hospital Admissions	20,100 (IQR 12,755-28,156)	27,230 (IQR 21,707-29,129)	22,678 (IQR 20,571-26,732)	0.34
Medical/Surgical ICU Beds	33 (IQR 18-54)	18 (IQR 16-41)	30 (IQR 27-65)	0.50
Total hospital beds	202 (IQR 177-372)	336 (IQR 225-377)	218 (IQR 188-295)	0.35
Residency Program	10 (100%)	8 (89%)	8 (89%)	0.52
Teaching Hospital	3 (30%)	3 (30%)	6 (67%)	0.30

Data for nonparametric continuous variables expressed as median (Interquartile Range); categorical values expressed as n (%). P values are Fisher’s exact test for categorical variables and Kruskal-Wallis test for nonparametric continuous variables. EDT = Emergency Department Thoracotomy