Table 1. Demographic, Medical Comorbidity, and Lifestyle Characteristics of Adult Patients With Acute Traumatic SDH Stratified by Receipt of Surgical Intervention.

Variable	All Patients With SDH	Evacuated	Not Evacuated
	(n = 1,427)	(n = 248)	(n = 1,179)
Male, n (%)	901 (63%)	163 (66%)	738 (63%)
Age*
Mean (SD)	58.2 (22.6)	60.8 (21.4)	57.6 (22.8)
Range	16–105	16–95	16–105
Age categories, n (%)*
16–25	172 (12)	29 (12)	143 (12)
26–40	180 (13)	20 (8)	160 (14)
41–55	282 (20)	33 (13)	249 (21)
56–70	270 (19)	67 (27)	203 (17)
71–85	363 (25)	73 (29)	290 (25)
>85	160 (11)	26 (10)	134 (11)
Race, n (%)†
White	1,117 (79)	183 (75)	934 (80)
Asian or Pacific Islander	94 (7)	25 (10)	69 (6)
African American	63 (4)	11 (4)	52 (4)
Native American	25 (2)	3 (1)	22 (2)
Other	116 (8)	23 (9)	93 (8)
Medical history, n (%)
Hypertension*	525 (37)	108 (44)	417 (35)
Cardiac disease	282 (20)	54 (22)	228 (19)
Diabetes	207 (15)	39 (16)	168 (14)
Previous trauma*	116 (8)	29 (12)	87 (7)
Gastroenterologic disease/cirrhosis*	119 (8)	26 (10)	93 (8)
Psychiatric disease	98 (7)	15 (6)	83 (7)
Respiratory illness	99 (7)	17 (7)	82 (7)
Cancer	106 (7)	12 (5)	94 (8)
Stroke*	106 (7)	28 (11)	78 (7)
Seizure disorder	76 (5)	17 (7)	59 (5)
Dementia	75 (5)	16 (6)	59 (5)
Other*	273 (19)	56 (23)	217 (18)
Lifestyle history, n (%)
Tobacco use	174 (12)	28 (11)	146 (12)
Alcohol abuse*	171 (12)	41 (17)	130 (11)
Drug abuse	80 (6)	8 (3)	72 (6)
No. comorbidities, n (%)‡
None	367 (26)	49 (20)	318 (27)
1	297 (21)	48 (19)	249 (21)
2	298 (21)	54 (22)	244 (20)
3	259 (18)	54 (22)	205 (17)
4 or more	206 (14)	43 (17)	163 (14)
Unknown	141 (10)	24 (10)	117 (10)

^*p < 0.05.

^†Twelve missing values include 3 evacuated and 9 not evacuated.

^‡Calculated as a total of medical and lifestyle history.