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. 2021 Oct 1;11:19601. doi: 10.1038/s41598-021-99100-7

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© The Author(s) 2021

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Equivalence boundaries (dotted lines left and right), mean of the mask / no-mask difference (diamond) and the 95% confidence interval (thin line; for the null hypothesis significance test), as well as the 90% confidence interval for the TOST (thick line). The x-axis shows the mean difference in the unit of the metric.