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Survival curves for COVID-19 patients admitted to the ICU with serum 25(OH)D concentrations > 9.9 and ≤9.9 ng/mL. The Kaplan–Meier survival curve showed that the 60-d mortality rate of those with 25(OH)D concentrations ≤ 9.9 ng/mL (n = 14, 71%) tended to be greater than that of those with concentrations > 9.9 ng/mL (n = 26, 31%) (P = 0.065). ICU, intensive care unit; 25(OH)D, 25-hydroxyvitamin D.
