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. Author manuscript; available in PMC: 2016 Nov 1.
Published in final edited form as: Ann Thorac Surg. 2015 Jul 21;100(5):1646–1652. doi: 10.1016/j.athoracsur.2015.04.086

TABLE 3.

Multivariable regression model using only preoperative characteristics.

Variable Coefficient P-value Lower 95% Upper 95%
Intercept 4.405 <0.001 4.383 4.426
Medium Risk (STS PROM 1–2%) 0.059 <0.001 0.038 0.079
High Risk (STS PROM 2–5%) 0.122 <0.001 0.101 0.143
Very High Risk (STS PROM >5%) 0.234 <0.001 0.207 0.260
Extremely High Risk (STS PROM >10%) 0.302 <0.001 0.270 0.334
Surgeon 2 0.032 <0.001 0.014 0.050
Surgeon 3 0.053 <0.001 0.035 0.071
Isolated aortic valve −0.001 <0.001 −0.022 0.019
Isolated mitral valve 0.055 <0.001 0.029 0.081
CABG+aortic valve 0.054 <0.001 0.028 0.080
CABG+mitral valve 0.030 0.123 −0.008 0.068
FY2010 −0.042 <0.001 −0.064 −0.021
FY2011 −0.015 0.059 −0.036 0.006
FY2012 0.022 0.043 0.001 0.04

The intercept was defined as a low risk (STS PROM < 1%) isolated CABG in FY2009 performed by Surgeon 1. The dependent variable was log-transformed total hospital costs. Coefficients reflect the mean impact of an increase in or the presence of each variable on log-transformed costs. The R2 of the regression was 0.33.