Table 8.

Comparison of post-treatment Insomnia Severity Index (ISI) category scores between treatment groups.

Variable	T1	T2	T3	T4	Chi-square	p-value
Pre-trial ISI score (mean rank)	145.18	148.61	129.78	158.49	4.481	0.214
Post-trial ISI score (mean rank)	160.68	140.24	149.36	133.12	4.27	0.233

*p-value was obtained by the Kruskal–Wallis H test with <0.05 level of significance. Data presented in mean rank.

T1: Placebo (starch tablets 250 mg × 2).

T2: Magnesium (250 mg × 2).

T3: Potassium (250 mg × 2).

T4: Magnesium + potassium (250 mg × 2).