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Objective: This study aimed to determine whether serum vitamin D is independently associated with COVID-19 infection and outcomes in patients with COVID-19. Methods: We identified relevant studies by searching the PubMed, Embase, and medRxiv databases from December 2019 to October 1, 2020. Odds ratios (ORs) were pooled using random-effects models. Only reports with multivariate adjusted results were included to avoid the impact of potential confounding factors. Results: A total of six studiesdoi:10.1101/2020.10.24.20218974 fatcat:3r4xk2bserhhnnr7fcci4qehd4