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Table 3 Comparison of Discrimination and Calibration of the SURPAS without Systemic Sepsis but with the Addition of CPT Specific Event Rates with Models adding an Indicator for Multiple CPTsa

From: Refining the predictive variables in the “Surgical Risk Preoperative Assessment System” (SURPAS): a descriptive analysis

Adverse outcome C-index Brier Score
Full Model with CPT Event Rate Same Model plus Multiple CPT Indicator Difference Full Model with CPT Event Rate Same Model plus Multiple CPT Indicator Difference
30-day mortality 0.928 0.929 0.001 0.0103 0.0103 0.0000
Morbidity 0.823 0.824 0.001 0.0880 0.0876 −0.0004
Readmission 0.723 0.723 0.000 0.0487 0.0487 0.0000
Infection 0.805 0.806 0.001 0.0442 0.0441 −0.0001
Bleeding/Transfusion 0.875 0.877 0.002 0.0408 0.0406 −0.0002
Pulmonary 0.893 0.894 0.001 0.0233 0.0232 −0.0001
UTI 0.776 0.777 0.001 0.0145 0.0145 0.0000
VTE 0.788 0.789 0.001 0.0086 0.0086 0.0000
Cardiac 0.871 0.871 0.000 0.0062 0.0062 0.0000
Renal 0.863 0.865 0.002 0.0059 0.0059 0.0000
Neurologic 0.840 0.84 0.000 0.0021 0.0021 0.0000
  1. aAbbreviations: SURPAS Surgical Preoperative Risk Assessment System, UTI Urinary tract infection, VTE Venous thromboembolism