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. 2022 Jan 19;4(1):fcab295. doi: 10.1093/braincomms/fcab295

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© The Author(s) (2022). Published by Oxford University Press on behalf of the Guarantors of Brain.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Work, smoking history and vaccination status of the participants. For the measures with multiple categories—transport means used to commute (A), work sector (E) and work from home status (F), χ²-test was run for each category of each measure and P-values were adjusted using the Bonferroni method (i.e. multiplying the number of categories in that measure). For the measures with binary outcomes, including smoking history (B and C) and COVID-19 vaccination history (D), χ²-test was used to assess between-group differences. Amongst all measures, only one measure showed significant difference: the COVID group showed a lower rate of COVID-19 vaccination [D, χ²(1,N = 15) = 8.6, P = 0.003]. No difference was found in other measures and annotated as n.s. (not significant).