"Vitamin D3 5000 IU supplementation was associated with a lower risk of influenza like illness (incidence rate difference: −1.7 × 10−4/person-day, 95%-CI: −3.0 × 10−4 to −3.3 × 10−5/person-day, p = 0.015) and a lower incidence rate for non-COVID-19 ILI (incidence rate difference: −1.3 × 10−4/person-day, 95%-CI −2.5 × 10−4 to −7.1 × 10−6/person-day, p = 0.038
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