*4.3. Statistical Analysis*

Data were analyzed using IPM SPSS Statistics version 23.0 (IBM Corporation, Ehningen, Germany). First, variables were tested for normal distribution using the Shapiro–Wilk test. To compare normally distributed values of two patient groups, Student's-*t*-test was used. The Mann–Whitney U-test was used for non-normally distributed continuous variables. For further analysis, we evaluated PSA-stratified LPR and evaluated categorical differences by Chi-square test and Pearson correlation. For comparing values of baseline and delayed imaging, i.e., SUVmax of PET-positive lesions, the Wilcoxon-signed-rank-test was used. Mean and SD are given if normality was observed. Additionally, for non-normal distributed variables, median and range were evaluated. *p* values < 0.05 were considered statistically significant.
