Table 2.

Demographic and injury characteristics of the Phase I (n = 19) and Phase II (n = 80) samples by TBI status. Data are presented as means/range unless otherwise noted^*.

	Phase I sample*		Phase II sample**
	Controls (n = 9)	TBI (n = 10)	Controls (n = 39)	TBI (n = 41)
Age	74.1 (71–90)	77.0 (65–87)	42.8 (22–76)	42.7 (21–81)
% Male	33%	40%	69%	68%
Mechanism of injury (%)	n/a	MVC 30	n/a	MVC 41.5
		Fall 70		Pedestrian 9.8
				Fall 21.9
				Assault 12.2
				Other 14.6
Initial ED GCS	n/a	14.1 (10–15)	n/a	14.9 (14–15)
Confirmed loss of consciousness (%)	n/a	Data not available	n/a	54%
Possible loss/altered consciousness (%)	n/a		n/a	19.5%
Post-traumatic amnesia (%)	n/a		n/a	48.8%
% having head CT performed	n/a	100%	n/a	75.6%
% CTs positive for intracranial pathology		90%		29%
Injury severity score (ISS)**	n/a	17.1 (95% CI 11.3; 25.3))	n/a	5.6 (95% CI 4.2; 7.0))
GOS-E	n/a		n/a
3 months		6.1 (4–8)		7.6 (5–8)
6 months		6.2 (4–8)		7.7 (5–8)

^*Phase I sample only enrolled older subjects.

^**Phase II sample restricted enrollment to AIS < 3 in systems other than head. n/a = not available