Demographic data are presented as the mean (A) ± standard deviation (SD) and the percentage in each group. The Shapiro-Wilk test was applied to assess the normality of data distribution. For data following a normal distribution, the t-student test was used to compare the expression of receptors between the groups. For variables without the normal distribution, the Mann-Whitney U test was performed. The significance of qualitative variables was verified using the chi-square test. Furthermore, the Spearman’s rank correlation was performed to check the relationships between two quantitative variables. In all calculations, the level of significance was set at p-value ≤ 0.05. The statistical power of performed test for showing a correlation between CBR expression PTB was 1 – ß = 0.9 (ɑ = 0.05).
Results