Statistical analysis
Statistical analysis was performed with the SPSS 15.0
package programme (Statistical Package for Social
Sciences; SPSS, Chicago, IL). Descriptive statistical
methods (median, standard deviation) were used for the
evaluation of the study data. Student
t
-test and Wilcoxon
tests were performed as appropriate for comparing the
difference on pre and post tests. Statistical significance was
considered to be achieved at the
p
5
0.05 level.