Statistical analyses
Continuous variables were presented as means with standard deviations (SD) for normally distributed data and medians with interquartile ranges (IQRs) for non-normally distributed data. Categorical variables were expressed as numbers with percentages. Between-group comparisons were tested for statistical significance using the Pearson chi-square test, Fisher exact test, unpaired t-test, Mann–Whitney U test, one-way ANOVA test, or Kruskal–Wallis test, as appropriate. Bonferroni correction was used for P-values to correct for the problem of multiple testing. Generalized estimating equation (GEE) models were used to examine the effect of the treatment on dnDSA titer between the IVIG + and IVIG- groups at 3 and 12 months with baseline. Detailed information about GEE model can be found in the 