Statistical analysis
Statistical evaluation was conducted with the IBM SPSS 15 package
program (SPSS Inc., Chicago, IL, USA). Numerical variables with normal
distribution are given as mean +/- standard deviation, numerical
variables without normal distribution are given as median
(minimum-maximum), and categorical variables as frequency (percentages).
In the case of two groups, the difference between the groups was
determined with the Student t Test for the numerical variables with
normal distribution, the Mann Whitney U Test for the numerical variables
without normal distribution, the Pearson Chi-Square Test and the Fischer
Exact Test. The relationship between numerical variables was determined
with the Pearson correlation analysis. P value of 0.05 was considered
statistically significant.