Statistical Analysis
Continuous data are presented as mean ± standard deviation for normally
distributed variables or median [interquartile range (IQR)] for
non-normally distributed variables. Categorical data are displayed as
number (percentage). Kaplan Meier analysis was used to evaluate one-year
survival. A probability analysis was conducted to identify estimated
rates of operative mortality based on CPB time over 300 minutes.
Statistical analyses were performed using SAS version 9.2 software (SAS
Institute, Cary, NC).