Statistical analysis
PMS
The participants’ demographic data analyzed using ANOVA, Chi-square, and Fisher's exact test. Shapiro–Wilk test confirmed the normality of data distribution in the three groups. Thus, parametric tests were used to assess the research variables. The main primary outcome variable of PMS in within groups comparison was assessed by Repeated Measures, and in between groups comparison measured by ANOVA. Within groups comparison was assessed by Paired samples t-test, and between groups comparison measured by ANOVA to evaluate of another main outcome variable of satisfaction with the intervention method. Secondary outcome variable vitamin D3 was measured via Repeated Measures for comparison of 25 hydroxy-vitamin D3 serum levels at baseline, week 6, and week10. All statistical calculations were performed at the significance level of less than 0.05 (