Statistical Analysis
Continuous, normally distributed data are presented as mean (± standard
deviation), and continuous, nonparametric data are presented as median
[interquartile range (IQR)]. Categorical data are displayed as a
number (percentage). Preoperative baseline characteristics were compared
between groups using Student’s t-test for normally distributed
continuous variables and Wilcoxon rank sum test for nonparametric
variables. Categorical variables were compared using either chi square
or Fisher’s exact test when appropriate.
Kaplan Meier survival analysis was used to compare one-year survival
among weight change cohorts. Multivariable Cox proportional hazards
modeling was performed to evaluate the risk-adjusted predictors of
one-year posttransplant mortality. B-spline regression was used to model
effects of weight loss across initial waitlisting BMI. Statistical
analysis was performed using Stata version 16.1 statistical software
(StataCorp, College Station, TX, USA).