Select the correct responses Mark the correct answer for each of the following r

Question

Select the correct responses

Mark the correct answer for each of the following regarding control groups:
a. In an experimental study (randomized, controlled clinical trial), the control group would
ideally receive a double-blind placebo treatment to minimize risk for bias.

b. In an observational cohort study the controls (unexposed subjects) would typically be free of
the disease under study at the start of the observation period.

c. In a case-control study the controls would be selected, in part, on the basis of the absence of
the disease under study.

d. The ideal controls for a case-control study would be as different as possible from the cases,
including one difference being the absence of the disease under study.

Explanation / Answer

The correct option is A

Explanation:

The study includes randomization of participants to the intervention and control groups and participants and evaluators are blinded, confounding and bias may be effectively controlled. This is also a powerful study design because the investigator has more control over the level of exposure.

Related Questions

Navigate

• Browse (All)
• Browse S
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.