With the descriptive statistic we determined frequencies
and percentages, means, standard deviation and chi-square.
The Mann-Whitney U test was used instead of student’s
t-test when the groups are not similar in size.15 We also used
multiple linear regression by stepwise method.
In the statistical analysis, we used SPSS (Statistical Package
for the Social Sciences) version 20.0 for Windows.
The research protocol was evaluated and approved by the
Ethic Committee and the informed consent statement was
obtained from all the participants.