| http://www.w3.org/ns/prov#value | - Since vitamin D production in the skin is dependent on skin pigmentation and amount of UVB exposure, 18 covariates such as race and season of vitamin D measurement are strongly related to vitamin D levels, so adjusting for them in a multivariate model likely represents over-adjustment for vitamin D. However, since both race and season likely affect asthma severity through pathways independent from
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