Statistical analyses
Data were analyzed with SPSS software version 25.0 for Windows (SPSS
Inc, Chicago, Illinois). The Kolmogorov-Smirnov test was used to test
whether the data were distributed normally. Continuous normally
distributed variables are expressed by their mean and standard
deviation. In multiple comparisons, one-way analysis of variance (ANOVA)
test followed by the Tukey post hoc test was used for normally
distributed continuous data. Nominal parameters were compared using
Chi-square test. Pearson’s correlation test was used for correlation
analysis. A multivariate linear regression model was used for analysis
to determine the independent predictors of GFR. Statistical significance
was defined as p<.05.