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Which would be notable if that ratio was significantly different from the general population...

Most of the severe cases are old people, most old people are vitamin d deficient. This could be a whole non finding.

They controlled for demographics.

And quite old, more than 70 percent who died with Corona in Sweden were 80 years or older, https://www.statista.com/statistics/1107913/number-of-corona...

Right-handedness doesn't attenuate immune response, which happens to be what puts COVID patients in the hospital.