Its from the same article.
1)partway through the study, the researchers switched from providing the dietary supplements in one large dose per day to two smaller doses per day. why did they make this decision?
a)results of another study showed that high doses of folic acid may be linked to increased risk of colorectal cancer.
b)the authors’ preliminary results showed that high doses of folic acid may be linked to increased risk of colorectal cancer.
c)the subjects complained that once-daily doses were too large to swallow.
d)the researchers found that absorption of once-daily doses was not as efficient as twice-daily doses.
2) the primary endpoint of the study was a change in
a)serum folate and vitamin b-12.
b)serum homocysteine.
c)physical activity.
d)cognitive function.
3)the study design is best described as a
a)retrospective cohort study.
b)case-control study.
c)randomized, controlled trial.
d)prospective cohort study.