Sure, but a bigger confounder is probably that vitamin D deficiency is associated with metabolic syndrome, CKD, obesity, diabetes, etc. These may be, for some p

Sure, but a bigger confounder is probably that vitamin D deficiency is associated with metabolic syndrome, CKD, obesity, diabetes, etc. These may be, for some people, indicative of lifestyle choices as well, but those choices are, I'd guess, not the direct cause of a person's inability to survive the disease.