Statistical Analysis
Frequencies and percentages of qualitative variables were calculated,
and arithmetic means and standard deviations of quantitative variables.
Averages were compared using the Student’s test for independent samples,
verifying the variables’ normality using the Shapiro-Wilk test. In the
absence of normal distribution, the Mann-Whitney U test was used. The
value of p < 0.05 was accepted to determine the significant
differences in the statistical tests. Kaplan-Meier survival analysis was
performed with the log-rank test to compare the survival distributions
of the samples. The analysis was performed using SPSS Statistics 24.