Avandia is an antidiabetic drug. In a study of tolerance and side effects of Avandia, 428 patients with prediabetes were given 4 mg of Avandia daily for 26 weeks. The researchers compared the patients' baseline cholesterol levels at the beginning of the study with their level after the 26 weeks of treatment. The results show a significant increase in their low-density lipoprotein (LDL) cholesterol ("bad cholesterol") level.
This is an example of
A) a retrospective, case-control observational study.
B) a prospective, cohort observational study.
C) a completely randomized experiment.
D) a matched pairs experiment.
Correct Answer:
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