We chose risk factors based on a minimal subset of nominally significant ORs within our training data as well as literature guidance. 3 4 7 9 11 12 14–16 For the susceptibility models without symptoms, we included a subset of exposure-related questions, based on the training OR analyses, as well as two demographic variables (age and sex).
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COVID-19 susceptibility and severity risks in a cross-sectional survey of over 500 000 US adults.
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