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Vitamin D study #102 of 109
5/28 Early treatment study
Sánchez-Zuno, J. Clinical Medicine, doi:10.3390/jcm10112378 (Peer Reviewed)
Vitamin D Levels in COVID-19 Outpatients from Western Mexico: Clinical Correlation and Effect of Its Supplementation
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Very small 42 PCR+ outpatient RCT in Mexico, 22 treated with vitamin D. Most patients had insufficient vitamin D levels, there were more symptoms in those with insufficient levels, and there were less cases with fever or with >3 symptoms at day 14 for treatment with vitamin D.

Sánchez-Zuno et al., 5/28/2021, Randomized Controlled Trial, Mexico, North America, peer-reviewed, 12 authors, dosage 10,000IU days 1-14.
risk of COVID-19 severe case, 89.4% lower, RR 0.11, p = 0.04, treatment 0 of 22 (0.0%), control 4 of 20 (20.0%), continuity correction due to zero event (with reciprocal of the contrasting arm), risk of >3 symptoms at day 14.
risk of no recovery, 80.8% lower, RR 0.19, p = 0.22, treatment 0 of 22 (0.0%), control 2 of 20 (10.0%), continuity correction due to zero event (with reciprocal of the contrasting arm), risk of fever at day 14, Table S1.

Effect extraction follows pre-specified rules prioritizing more serious outcomes. For an individual study the most serious outcome may have a smaller number of events and lower statistical signficance, however this provides the strongest evidence for the most serious outcomes when combining the results of many trials.
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