Statistical analyses
Statistical analyses were performed using the SPSS software version 25.
The variables were investigated using visual (histograms, probability
plots) and analytical methods (Kolmogorow-Simirnov/Shapiro-Wilk’s test)
to determine whether they are normally distributed or not. Descriptive
analyses were presented using means and standard deviations for normally
distributed variables. Comparisons were made using the t test,
chi-square test, Fisher’s exact test, and analysis of variance.
Variables that are found to be significant (p < 0.05) in
univariate analysis were tested in multivariate analysis, which was
performed using a stepwise logistic regression model. Values of p
< 0.05 were considered statistically significant. Survival
analyses were made using Kaplan-Meier test.