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. 2021 Apr 17;21:125. doi: 10.1186/s12906-021-03297-z

Fig. 6.

Fig. 6

Forest plot comparison of magnesium supplementation compared to placebo for total sleep time (TST) outcome N.B.: Inverse-variance weight method applied; Sleep onset latency converted to same unit (minutes); Statistical tests for heterogeneity (Chi2 and I2) can be unreliable with small sample sizes – heterogeneity explored using other strategies