Statistical Analysis

Mean and standard deviations were provided for the description of continuous variables, and total number and frequency for the description of non-continuous variables. χ² test was used to compare qualitative data, while Student's T-test was used to compare parametric quantitative data. Pearson's test was used as the correlation test. Correlation was classified according to the correlation coefficient (r) into weak (r < 0.5), moderate (0.5 > r < 0.75) and strong (r > 0.75) correlation. We considered the raw MFI value of anti-HLA antibodies in all detection assays to perform the statistical analyses. All studied sera were included in the analyses. Values of p < 0.05 were regarded as statistically significant.