Table 4. Univariate analysis for dependent complication variable: in-hospital mortality.

Degrees of freedom=1; sample size=92

P-value <0.2 was the threshold for inclusion in multivariable logistic regression analysis

DVT/PE: deep vein thrombosis and/or pulmonary embolism; ISS: Injury Severity Score; UTI: urinary tract infection

	Χ2 statistic	P-value
Patient factors
Male gender	0.3	0.585
Age >65 years	2.6	0.107
Age >80 years	0.5	0.469
Smoking	0.3	0.611
hypertension	2.9	0.091
Diabetes	0.8	0.368
Anticoagulation	6.6	0.01
Alcoholism	3.6	0.058
Coronary disease	6.2	0.012
Injury factors
Complete injury	6.4	0.011
High level (C1-C4)	0	1
Polytrauma (ISS >15)	2.7	0.099
Surgery factors
Surgical time >120 minutes	0.01	0.901
Greater than 5 levels instrumented	3.02	0.0819
Anterior instrumentation	1.9	0.174
Posterior instrumentation	0.6	0.413
Anterior and posterior instrumentation	0	1
Complications
In-hospital stroke	0	1
In-hospital DVT/PE	2.1	0.145
In-hospital pressure injury	0	1
In-hospital respiratory infection	0.4	0.536
In-hospital UTI	1.2	0.283
Ventilator dependency	13.6	<0.001