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Thanks for your thoughts. I agree that it is a bit unexpected that asthma got into one model but not another. It may have co-varied with other variables including respiratory rate or oxygen saturation. Since submitting this article to Annals, we have published another prediction model n the Journal of the American Board of Family Medicine that I think is more relevant for family physicians. It is a simple model that predicts the risk of hospitalization in primary care outpatients during the omicron wave, and performed at least as well as the COVID-Lab and SimpleLab risk scores. The link is here: https://www.jabfm.org/content/early/2022/09/15/jabfm.2022.ap.220056.abst... . We have also implemented it as a free app written using R Shiny here: https://ebell-projects.shinyapps.io/LehighRiskScore/ We think that it is simple enough to memorize and easily incorporate into primary care practice. As you can see, one of the risk factors is "Any comorbidity" from a list that includes asthma.
Again, thanks for your comments. And Go Blue! ;-)