In countries known to contain lower lovels of vitamin D, there were more reporte

Question

In countries known to contain lower lovels of vitamin D, there were more reported cases of a particular type of rare discase. Some rescarchcrs hypotnosizod that a deficicncy in vitamin D would incrcase the risk of devcloping the discase. Thesc rescarchers compared vilanin D levels in blood sariples fro 100 exuarige sludents who have developed the disease wih blocd saiples of nearly 320 we have nol. The samples were laken, on average, live years before the disease was diagised. Tose with the highest blood vitamin D levels had a 79% lower risk of developing the disease than those with the lowest levels. Complete parts ) through d) a) What kind of study was this? Select all that apply. Experiment observational Retrospective Prospective b) ls that an appropriate choice for investigating this problen? Explain OA. Yes, because the disease in the study is a rare disease, a prospectve study is appropriate O B. Yes, because the diseese in the study is a rare disease, a retrospective study is appropriate. C. No. For rare diseases it is better to perform an experimert rather than prospective study. O D. No For rare diseases, it is better to pertorm an experiment rather than a retraspecve study

Explanation / Answer

a) Experimental and prospective study.

b) No, for a rare disease it is better to perform experiment than Prospective study.

c) All the people reprensentative of the contries under study.

d) The variables were, the level of vitamin D, for the subject , the number of subjects who developed the disease and the number of subjects who did not develop the disease.

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