Statistical Analysis
Continuous data was expressed in terms of mean +/- standard deviation or
median (IQR) and compared with ANOVA or Mann-Whitney U test. Categorical
data was evaluated using chi-squared test. Multivariate logistic
regression for weighted outcomes was utilized to compute odds ratio for
in-hospital mortality and complications. We considered non-emergency
CABG and emergency CABG separately and performed the analysis for all
centers and transplant centers for each. Total hospital charges and LOS
were evaluated with linear regression testing. In the linear and
logistic regression testing, the general population (no history of
transplant or immunosuppression, or Non-Tx) was set as the reference
category. The multivariate analysis was adjusted for potential
confounding factors. In order to attain robust statistical conclusions,
total hospital change and LOS values were transformed to normal
distribution via log-transformation procedure. Additionally, we adjusted
the total charges based on consumer inflation index (CPI) 2020 to be
able to compare the charges present. Statistical analysis was performed
using IBM’s Statistical Package for Social Sciences (SPSS) software
version 25 (IBM Corp, Armonk, NY).
Results: