New meta-analysis of 18 studies finds that smokers are *82% less likely* to be hospitalised with COVID-19 than nonsmokers.https://www.mdpi.com/1660-4601/17/20/7394/htm …
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No consideration of reporting bias (they used medical codes to capture smoking status in most studies, which can miss people!)
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No discussion of the included study quality or of hospitalization bias, just a huge number of places that biases could've crept in. They even talk about how the lack of correction for age makes the results problematic in the study!pic.twitter.com/kmcThhcjAo
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