Statistical analysis
Continuous data are presented as mean ± standard deviation for parametric data and median (interquartile range, IQR) for non-parametric data. Categorical data are presented as number (percentage). Student’s t test, analysis of variance (ANOVA), and Mann-Whitney U test were utilized for pairwise comparison of parametric and non-parametric data, as indicated. Risk adjusted post-OHT mortality was evaluated using multivariable Cox Frailty regression with random effects and transplant center as the nested variable. Statistical analyses were performed using the SAS version 9.4 software package (SAS Institute Inc, Cary, NC).