Statistical methods
REGRESSION
Data obtained from the tests and interviews were entered into SPSS software, version 22, and then subjected to statistical analysis. All variables were reported on the basis of mean and standard deviation. The Kolmogorov–Smirnov test was used to determine the distribution of data. Paired t-test was used for comparison of normally distributed variables within group before and after the study. The ANOVA was used for comparison of the means of three groups. After ANOVA was run and it found significant results overall, then Tukey’s Honest Significant Difference test, a post-hoc test based on the studentized range distribution, was used to find out which specific groups’ means (compared with each other) are different. The ANCOVA test was used to adjust the effect of variables such as age and baseline level of variables. The statistical test of multiple linear regression was used to show the association of 