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. Author manuscript; available in PMC: 2011 Oct 1.
Published in final edited form as: Spine J. 2010 Oct;10(10):881–889. doi: 10.1016/j.spinee.2010.07.391

Table1.

Multiple Logistic Regression Models

Model 1 Model 2 Model 3 Model 4
Outcomes Vital status
(died/alive)		 Vital status
(died/alive)		 Vital
status(died/alive)		 Any procedure
related
complication(yes/no)
Predictors Comorbidity
index		 Individual
comorbidities		 Perioperative
procedure
related
complications		 Individual
comorbidities
Covariates Procedure types,
surgical
indications,
patient
demographic and
health care
system related
variables		 Procedure types,
surgical
indications,
patient
demographic and
health care
system related
variables		 Procedure types,
comorbidity
index, surgical
indications,
patient
demographic and
health care
system related
variables		 Procedure types,
surgical indications,
patient demographic
and health care
system related
variables