Table 1. Trauma Population Characteristics for Those With and Without Severe Head Injuries.

Variable	Severe head injury (n=335)	No severe head injury (n=687)	p Value
Patient age, y	35.0 [29.0]	43.0 [30.0]	<0.001
Sex, female	19.4%	30.7%	<0.001
Race/Ethnicity			0.56
White	84.2%	81.4%
Black	10.4%	13.4%
Hispanic	3.9%	4.5%
Native American	0.3%	0.1%
Other	0.3%	0.3%
Comorbidities
Coronary artery disease	10.4%	13.6%	0.19
Cerebrovascular disease	3.0%	2.8%	0.84
Chronic renal disease	0.9%	0.9%	>0.99
Corticosteroids	0.6%	1.3%	0.52
Liver disease	2.7%	3.4%	0.70
Malignancy	3.3%	1.5%	0.06
Peripheral vascular disease	1.2%	2.0%	0.45
Pulmonary disease	6.0%	11.4%	0.01
Autoimmune disorders	0.0%	1.9%	0.01
Diabetes mellitus	6.0%	7.9%	0.31
Interventions
Mechanical ventilation	97.9%	90.4%	<0.001
Total ventilator days	7.0 [6.0]	7.5 [8.0]	0.01
Trachesotomy	12.7%	8.9%	0.07
Transfusions	62.7%	77.1%	<0.001
Penetrating trauma	6.3%	14.2%	<0.001
Scoring
ISS	34.0 [13.0]	25.0 [17.0]	<0.001
Abdomen	0.0 [2.0]	2.0 [3.0]	<0.001
Chest	3.0 [4.0]	3.0 [2.0]	<0.001
Extremities	2.0 [3.0]	2.0 [3.0]	<0.001
Face	0.0 [2.0]	0.0 [1.0]	<0.001
Head or neck	5.0 [1.0]	0.0 [2.0]	<0.001
External	0.0 [1.0]	0.0 [1.0]	0.83
GCS (Admit)	6.0 [5.0]	9.0 [5.0]	<0.001