Table 5.

Mortality: analysis from landmark to dead or discharge. Dead or discharged at/before landmark were excluded.

Model	No. of patients at risk (no. of deaths)			Unadjusted			Adjusted **			Adjusted ***
	IVC filter	Non-IVC filter	Total	Hazard ratio	95 % CI	P	Hazard ratio	95 % CI	P	Hazard ratio	95 % CI	P
All patients*	282 (22)	1169 (92)	1451 (114)	0.89	0.62,1.27	0.51	0.50	0.33,0.78	0.002	0.51	0.33,0.80	0.004
Landmark set at day 2 after injury	203 (15)	1082 (70)	1285 (85)	1.43	0.95,2.15	0.09	1.16	0.71,1.88	0.56	1.16	0.71,1.91	0.56
Landmark set at day 3 after injury	231 (15)	935 (59)	1166 (74)	1.17	0.74,1.84	0.50	1.02	0.60,1.75	0.93	1.03	0.60,1.77	0.92
Landmark set at day 5 after injury	249 (13)	662 (37)	911 (50)	0.87	0.51,1.49	0.61	0.76	0.40,1.47	0.42	0.77	0.40,1.49	0.44
Landmark set at day 7 after injury	239 (9)	471 (25)	710 (34)	0.87	0.47,1.62	0.66	0.82	0.38,1.74	0.60	0.83	0.39,1.77	0.63

95 % CI = 95 % Confidence Interval.

IVC filter = Inferior Vena Cava filter.

^*Person-time before IVC filter placement (immortal time) excluded.

^**Adjusted for propensity score with variables included as shown in Table 1.

^***Adjusted for propensity score and pharmacological thromboprophylaxis during hospitalization.