Figure 1. Flow of Patients in a Study of the Effect of a High Dose of Vitamin D₃ on Patients With Moderate to Severe Coronavirus Disease 2019 (COVID-19).

All analyses were completed according to the patients’ randomization group. There was no imputation for missing data, except for laboratory parameters, in which missingness appeared to be at random and was modeled using generalized estimating equations. 25(OH)D indicates 25-hydroxyvitamin D.