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Vitamin D study #44 of 71
12/5 Analysis of outcomes based on serum levels
Alguwaihes et al., Cardiovascular Diabetology, doi:10.1186/s12933-020-01184-4 (Peer Reviewed)
Diabetes and Covid-19 among hospitalized patients in Saudi Arabia: a single-centre retrospective study
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Retrospective 439 diabetic hospitalized patients in Saudi Arabia showing lower mortality with vitamin D >12.5 nmol/L, adjusted hazard ratio aHR 0.14, p = 0.007.

Alguwaihes et al., 12/5/2020, retrospective, Saudi Arabia, Middle East, peer-reviewed, 10 authors.
risk of death, 85.7% lower, RR 0.14, p = 0.007, high D levels 111, low D levels 328, >12.5 nmol/L.

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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