Identify which of the following is/are observational studies.
A.An examination of the medical records of more than 360,000 Swedish men showed that those who were overweight or who had high blood pressure had a higher risk of kidney disease.
B.Subjects were randomly assigned to two groups and one group was given an herb and the other was given a placebo. After six months, the number of colds caught by individuals in each group were compared.
C.Researchers wanted to study the effect of an herb on reducing the side effects of menopause on women.

Question

Identify which of the following is/are observational studies. 
A.An examination of the medical records of more than 360,000 Swedish men showed that those who were overweight or who had high blood pressure had a higher risk of kidney disease.
B.Subjects were randomly assigned to two groups and one group was given an herb and the other was given a placebo.  After six months, the number of colds caught by individuals in each group were compared.
C.Researchers wanted to study the effect of an herb on reducing the side effects of menopause on women.

anonymous · Answer

D.In Parents magazine, it reported that a study found a positive association between the frequency and severity of heartburn during pregnancy of the mother and how much hair the newborn baby has. According to the study, about two thirds of women who reported to have modest to severe heartburn during pregnancy gave birth to babies with full head of hair, while most of women who didn't have heartburn during pregnancy have babies with little hair.
E.In 2002, the journal Science reported that a study of women in Finland indicated that having sons shortened the lifespans of mothers by about 34 weeks per son, but that daughters helped to lengthen the mothers' lives.

anonymous · Answer

nice piece of info.But what you wanna ask?