Statistical analyses
Descriptive statistics were reported as median and range for continuous
variables and frequencies and proportions for categorical variables.
Comparisons for baseline patient characteristics between white and black
groups were performed using permutation chi-square test or median test
depending on the data type. The primary endpoint, overall survival (OS),
was defined as the duration of time from transplant to time of death or
the date of the last follow-up reported to the CIBMTR database. The
overall survival was characterized using Kaplan-Meier plots and the
log-rank test was used to examine differences in survival by race and
HLA-match within each race type. A P value of less than 0.05 was
considered significant. All analyses were performed with SPSSĀ®
statistical program version 25-26 (IBM Corp., Armonk, N.Y., USA) and R
version 4.0 (R Core Team, 2020).