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Length of hospitalization (A) and in-hospital mortality rate (B) in COVID-19 patients according to serum levels of 25OHD; * p = 0.005 considering patients with 25OHD levels < 10 ng/mL compared with those with 25OHD levels > 10 ng/mL; ** p = 0.04 considering patients with 25OHD levels <20 ng/mL compared with those with 25OHD levels >20 ng/mL.
