RECOVER Query: Vaccination

This query examines the effect of vaccination (prior to COVID-19 infection) on the risk of PASC. When considering patients across all sites we see a modest protective effect of vaccination on PASC with an odds ratio of 0.81 (0.79, 0.83). Limiting to sites with more reliable vaccination information yields an odds ratio of 0.95 (0.91, 0.99). The sensitivity of the effect to which sites are included suggests the presence of potential confounding factors at the site level.