| http://www.w3.org/ns/prov#value | - We next developed a multivariate logistic regression model including basic demographic characteristics, such as sex and surgical subspecialty (vascular, cardiothoracic, or neurologic surgery); variables that were significant on bivariate analysis at P = .10 included years in clinical practice, practice type (private, academic, or private with academic affiliation), and ICU administrative model (cl
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