Statistical analysis
Overall survival was expressed as the time from the moment of diagnosis
to the death of the patient or the last follow-up period, and
recurrence-free survival (RFS) was expressed as the time from the moment
of diagnosis until the BCR which means the PSA values were detected
above ≥0.2 ng/ml in two separate measurements in the postoperative
period or the death of the patients. All data were summarized as numbers
and percentages for statistical analysis. The HP features and clinical
and prognostic data obtained were compared. In the statistical analysis
of the data, ”SPSS 24.0 for Windows” (IBM, Chicago, IL, USA) program was
used. While evaluating the study data, besides descriptive statistical
methods (mean, standard deviation), the chi-square test was used to
examine the relationship between parametric values in comparison of
categorical data, and Fisher exact test was used to compare two
non-parametric groups. Mann Whitney U test was used for the analysis of
variables that did not show normal distribution. Logistic regression
analysis was used for the rate at which the independent variables affect
the dependent variable. Kaplan-Meier analysis was used to calculate
survival probabilities. Results were analyzed at a 95% confidence
interval. p≤0.05 was considered as statistically significant.