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Vitamin D study #50 of 96
12/9 Analysis of outcomes based on serum levels
Vassiliou et al., Nutrients, doi:10.3390/nu12123773 (Peer Reviewed)
Low 25-Hydroxyvitamin D Levels on Admission to the Intensive Care Unit May Predispose COVID-19 Pneumonia Patients to a Higher 28-Day Mortality Risk: A Pilot Study on a Greek ICU Cohort
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Small prospective study of 30 ICU patients, showing higher mortality risk for low vitamin D levels. When divided into two groups at the median level, there was 5 of 15 deaths for the low vitamin D group compared to 0 of 15 in the high vitamin D group.

Vassiliou et al., 12/9/2020, prospective, Greece, Europe, peer-reviewed, 6 authors.
risk of death, 90.9% lower, RR 0.09, p = 0.04, high D levels 0 of 15 (0.0%), low D levels 5 of 15 (33.3%), continuity correction due to zero event (with reciprocal of the contrasting arm), >15.2ng/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.
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