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Vitamin D study #30 of 126   Meta Analysis
10/5 Analysis of outcomes based on serum levels
Yılmaz et al., Pediatric Pulmonology, doi:10.1002/ppul.25106 (Peer Reviewed)
Is vitamin D deficiency a risk factor for COVID‐19 in children?
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Retrospective 40 hospitalized pediatric COVID-19 patients and 45 healthy controls showing significantly lower vitamin D levels for COVID-19 patients (13.1 vs. 34.8µg/L), and that, within the hospitalized patients, there was more moderate and severe cases for patients with low vitamin D levels (non-statistically significant due to the small numbers).

Yılmaz et al., 10/5/2020, retrospective, Turkey, Middle East, peer-reviewed, 2 authors.
risk of severe case, 73.4% lower, RR 0.27, p = 1.00, high D levels 0 of 11 (0.0%), low D levels 2 of 29 (6.9%), continuity correction due to zero event (with reciprocal of the contrasting arm), >20ng/ml.
risk of moderate or severe case, 41.4% lower, RR 0.59, p = 0.69, high D levels 2 of 11 (18.2%), low D levels 9 of 29 (31.0%), >20ng/ml.

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.
All 126 studies   Meta Analysis
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