|Quintiles, Vitamin D blood levels in senior citizens by various regions. Source|
This paper suggests that blood Vitamin D levels over 50 ng/ml have a VERY high level of protection against Covid
morality mortality. VERY high meaning "close to zero morality", a term rarely used by statisticians or doctors.
One of the nagging question addressed by this paper is the question "Do low Vitamin D levels imply risk or does Covid reduce Vitamin D levels?" It is a chicken-or-egg question. This study attempted to resolve that question by focusing on Vitamin D levels "...preinfection or on the day of hospital admission..."Also
Regression suggested a theoretical point of zero mortality at approximately 50 ng/mL D3.
The datasets provide strong evidence that low D3 is a predictor rather than just a side effect of the infection. Despite ongoing vaccinations, we recommend raising serum 25(OH)D levels to above 50 ng/mL to prevent or mitigate new outbreaks due to escape mutations or decreasing antibody activity. Emphasis mine.
The red line added to the table of numbers shows how many quintiles have fewer than 50 ng/ml.
ESTHER is a German study of about 10,000 people
Tromso is a Norwegian study of 37,000
MONICA/KORA is a study out of Bavaria of 13,000 participants
SENECA is a numerically small study (2000 participants) that included residents of Belgium, Denmark, France, Italy, the Netherlands, Portugal, Spain, Switzerland, Poland, Hungary, Norway and Greece.
HAPIEE is from Eastern Europe and the data is from Czechoslovakia, Poland and Lithuania. The non-normal looking data between quintiles for the countries on the Baltic may be due to non-fish-eaters and fish-eaters.
NHANES is from the United States and had approximately 30,000 participants.
Approximately 20% of US citizens between the ages of 50 and 79 have Vitamin D titers that put them in the at-risk category for Covid mortality.
Between 40% and 100% of that age group in Europe is in the at-risk category. Data from Europe shows a high degree of regional variability.
Vitamin D is available as an inexpensive, dietary supplement.