2-6 Statistical analysis
The statistical package for social sciences (SPSS) software for Windows version 18 (IBM Inc., Chicago, IL, USA) was used for data analysis. Between-group comparison of nominal or the categorical variables was ascertained with the use of chi-square test or Fisher’s exact test. After determining normality using the Shapiro-Wilk test, the between-group comparison of continuous variables was ascertained using independent sample T or Mann-Whitney U Test (non-normal distribution). Analysis of covariance (ANCOVA) test was used to determine the mean change and effect size with the adjustment for sex and age. P-value <0.05 was considered statistically significant.