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brainburger t1_itqfyl8 wrote

The study does directly propose the matter of non-causal correlation in the introduction. The purpose seems to be to test whether its that, or is it that exercise enhances the vaccine.

>Background Both vaccination and physical activity have been shown to independently decrease the likelihood of severe COVID-19 infection.

>Objective To assess the association between regular physical activity and vaccination against COVID-19 among healthcare workers.

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