Association between short-term exposure to air pollution and COVID-19 mortality in all German districts: the importance of confounders.

Many of the associations remained similar between the two time periods, however, some showed changes such as the vaccination rate which was first positive (IRR: 1.23, p : 0.8), when barely any full vaccinations were performed, then negative one year later, although still not quite significant (IRR: 0.83, p : 0.07).

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