Statistical Analysis
The data of the demographic variables were tabulated in the spreadsheet of the Microsoft Excel 2010 program. The data is expressed as the mean ± standard deviation. The independent t- test was used to compare the study groups. The paired t- test was used to compare the variables before and after the intervention. A P value of less than 0,05 was considered statistically significant. The package IBM SPSS Statistics 20 (SPSS Inc., Chicago, IL, USA) was used for statistical analysis.