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Or even that people who take supplements are more likely to get a “just in case” Covid test than someone who doesn’t supplement.
by rflrob 6y ago
Or even that people who take supplements are more likely to get a “just in case” Covid test than someone who doesn’t supplement.
- MiroF 6y ago^ I think this is potentially the largest lurking variable here.
- graeme 6y agoThis would mean we should expect positivity and vitamin d levels to correlate. The study found reverse correlation.
- MiroF 6y agoI can see how it's confusing, but no. If the type of person to take Vitamin D comes in for a test with less symptoms "just in case", then the probability that they are positive given that they are tested is lower.
- graeme 6y agoOh you’re right. I didn’t think carefully enough. Thanks! This does seem like a major factor to tease out.
- ineedasername 6y agoNo, if it's true, then it means that people taking taking vitamin D are more geared towards preventative measures, so they are more likely to get tested when in the absence of symptoms. More people who don't need to get tested would result in more negative test, so the inverse correlation is still the expects result.
- ineedasername 6y agoYes: There's evidence that lower-incomes are associated with less use of vitamin supplements [0]. And higher incomes would correlate to higher levels of health-care coverage that would allow for "just in case" testing. [0] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2843812/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2843812/