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Flow chart of the study design. Of 14 022 subjects, aged 2 months to 103 years, who were tested for COVID‐19 infection, 1416 (10.1%) had at least one positive result; 12 606 (89.9%) had only negative results. After excluding the 6215 individuals without data on plasma 25(OH)D levels, the study sample composed of 7807 individuals. Also for this sample, the proportion of infected individuals was 10.02% (782/7807) for COVID‐19‐P, and 7025 (89.98%) for COVID‐19‐N.
