Table 2

Cox proportional hazard model—risk of VTE

	HR	95% CI	P value
Major venous repair	2.81	1.78 to 4.45	<0.01
Central venous catheter	2.38	1.59 to 3.56	<0.01
Trauma Embolic Scoring System	1.09	1.03 to 1.15	0.01
Subprophylactic enoxaparin*	1.08	0.70 to 1.67	0.73
Subprophylactic heparin*	6.09	3.29 to 11.27	<0.01
Aspirin (any dose)	0.57	0.36 to 0.88	0.01

*Doses of anticoagulation given at levels under the institutional guidelines and/or missed doses with adequate prophylactic dosing representing the reference category for comparison.