Table 1.

Demographics

Variable	Early PPX (n=260, 52%)	No Early PPX (n=241, 48%)	p
Age (years)	43 (28, 61)	49 (30, 62)	0.08
Male (n, %)	195 (75%)	169 (70%)	0.28
Blunt (n, %)	237 (91%)	232 (97%)	<0.01
AIS head ≥3 (n, %)	174 (67%)	171 (71%)	0.27
AIS chest ≥3 (n, %)	136 (52%)	102 (42%)	0.03
AIS abd ≥3 (n, %)	46 (18%)	60 (25%)	<0.05
AIS extremity ≥3 (n, %)	36 (14%)	27 (11%)	0.38
Bilateral lower extremity fractures	8 (3%)	3 (1%)	0.23
ISS	24 (17, 30)	21 (16, 30)	0.16
Obese (BMI ≥30) (n, %)	73 (28%)	73 (30%)	0.59
Hemoglobin (g/dL)	12.9 (11.6, 14.7)	13.3 (11.7, 14.3)	0.73
Base excess (mEq/L)	−4 (−6, −1)	−3 (−6, 0)	0.21
Platelet count (x109/L)	201 (161, 256)	204 (162, 249)	0.96
rTEG ACT (sec)	113 (105, 121)	113 (105, 121)	0.60
rTEG K-time (min)	1.4 (1.2, 1.8)	1.4 (1.1, 1.8)	0.56
rTEG alpha angle (deg)	73 (69, 76)	73 (69, 77)	0.50
rTEG max amplitude (mm)	63 (58, 68)	64 (59, 68)	0.26
rTEG LY30 (%)	0.9 (0.2, 2.4)	1.1 (0.2, 2.6)	0.69
Spine cord injury level (n, %)			0.19
Cervical spine	166 (63%)	157 (66%)
Thoracic spine	70 (27%)	51 (21%)
Lumbar spine	25 (10%)	32 (13%)
Complete injury (n, %)	69 (27%)	60 (25%)	0.67
ISH on admission (n, %)	123 (47%)	107 (44%)	0.51
Epidural hematoma	113 (92%)	96 (90%)	0.94
Subdural hematoma	5 (4%)	6 (5%)
Other*	5 (4%)	5 (5%)
Operative spine intervention	169 (65%)	193 (80%)	<0.001
Time to operation (days)	1.48 (0.63, 3.46)	1.24 (0.70, 2.18)	0.18

^*including subarachnoid and intraparenchymal hemorrhage

AIS, abbreviated injury scale; ISS, injury severity score; rTEG: rapid thromboelastography; ACT, activated clotting time; LY30, lysis at 30 minutes; ISH, intraspinal hematoma