I assume the elderly would have higher rates of deficiency due to being indoors more, and that 45% number is also out of date during the pandemic when a lot of people are staying home.
The deficiency doesn’t have to do with being indoors. It has to do with how their body functions and absorbs sunlight. If the 45% number is low because of the pandemic itself then we wouldn’t be seeing such a huge decrease in deaths from the disease if it were a major factor.
