Health, 11.11.2019 20:31 avilaaa

Ms and vitamin d: multiple sclerosis (ms) is an autoimmune disease that strikes more often the farther people live from the equator. could vitamin d - which most people get from the sun's ultraviolet rays - be a factor? researchers compared vitamin d levels in blood samples from 150 us military personnel who have developed ms with blood samples of nearly 300 who have not. the samples were taken, on average, five years before the disease was diagnosed. those with the highest blood vitamin d levels had a 62% lower risk of ms than those with the lowest levels. (the link was only in whites, not in blacks or hispanics).
a) what kind of study was this?
b) is that an appropriate choice for investigating this problem? explain.
c) who were the subjects?
d) what were the variables?

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