Statistical analysis
A Wilcoxon rank-sum test evaluated the difference between the HU of
pre-contrast enhancement (HUpre) and that of
post-contrast enhancement (HUpost). We compared the mean
HU in the DDFT and palmar arteries at each site, calculating the
difference between HUpre and HUpost(HUpost − HUpre) of the DDFT.
Statistical analyses were performed using the non-parametric Kruskal−
wallis rank-sum test and Spearman’s rank correlation analysis for
assessing groups. A Wilcoxon rank-sum test was performed for the
post-hoc test. The P value was adjusted using the Bonferroni method.
Statistical significance was set at P < 0.05. All statistical
analysis was processed using RStudio (RStudio, Boston, MA).