2.7 Statistical Analysis
Biostatistical analysis of the data obtained was performed with SPSS (Statistical Package for Social Sciences) for Windows v. 21.0 package software. The normality of the data was analyzed with the Kolmogorov-Smirnov test. Continuous variables were expressed as mean ± standard deviation and categorical variables with frequency and percentage (%). Descriptive statistics regarding normally distributed variables were expressed as mean ± standard deviation. Whereas, non-normally distributed variables were given with median, minimum, and maximum values. In the statistical evaluations, correlations between categorical variables were examined with the Chi-square test, while Pearson’s correlation analysis was used to determine the direction and level of the correlations between the variables. Normally distributed variables were analyzed using Student t test, and non-normally distributed variables were analyzed using Mann-Whitney U and Kruskal-Wallis tests. p<0.05 values considered statistically significant.