Consider the Following Results from a Prospective Cohort Study,in Which

Multiple Choice

Consider the following results from a prospective cohort study,in which the dietary intake of 50,000 people were recorded and the health status,including the occurrence of disease,was monitored for 10 years. $$\begin{array} { | l | l | } \hline \text { Quintiles } & \text { RR for disease } \\\hline 1 - \text { lowest nutrient intake } & 1 \\\hline 2 & 0.80 \\\hline 3 & 0.72 \\\hline 4 & 0.66 \\\hline 5 \text { - highest nutrient intake } & 0.55 \\\hline\end{array}$$ Which statement best describes these results?

A) These results are from an intervention trial and illustrate an inverse relationship between nutrient intake and disease risk
B) These results are from an observational study and suggest that there is a direct relationship between nutrient intake and disease risk.
C) These results are from an observational study and suggest that increasing nutrient intake may be associated with reduced risk of disease
D) These results are from an observational study and demonstrate causation between nutrient intake and reduced disease risk.