Statistical analysis
The chi-square test used to analyze categorical variables, presented as
numbers, and percentages. The Kolmogorov–Smirnov test was used to check
the normality of continuous variables. Normally distributed continuous
variables are presented as means with standard deviations and were
analyzed with student’s t-test. Non-normally distributed continuous
variables are presented as medians with interquartile ranges and were
analyzed using the Mann–Whitney U-test. The Kaplan–Meier curve with
the log-rank test was used for the survival analysis. SPSS for MAC ver.
26 (SPSS Inc., Chicago, IL, USA) was used for the statistical analysis.
Statistical significance was set at a p-value of <0.05.