Which of the following are randomized controlled trials? a. Investigator randoml

Question

Which of the following are randomized controlled trials?

a.     Investigator randomly selects 1,000 patients to review their medical records for incidence of cardiovascular disease

b. Investigator randomly assigns individuals to medication or medication plus counseling to treat depression

c. Investigator randomly assigns clinics to implement (or not implement) a behavioral health intervention

d. Investigator enrolls a random sample of 500 patients who complete a questionnaire about current and prior medications they have received

Both A and D

Both B and C

All of the above

Explanation / Answer

randomized controlled trial (RCT) is a study in which people or subjects are selected at random to receive one of the several clinical effects. one group serves as control and the other group as test. two groups are given two different clinical interventions in order to compare the effect of the intervention.

option b- here, individuals are selected randomly into two groups. one group would receive onle medication, while the other group receives medication plus counselling.

this can be considered as RCT.

Option c- clinics are randomly assigned either to implement or not implement a health intervention. one random group of clinics would implement, while the other group would not implement.

BOTH B and C

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