Question

Why is randomization important to assignment in an RCT?

Select one:

a. It enables blinding/masking

b. So causation may be extrapolated from results

c. It balances out individual characteristics between groups.

d. A and C

Answer 1

Answer

d)

A and C are correct,

because

i)Blinding eliminates biased measurement, so that outcomes are measured with the same
degree of accuracy and completeness in every participant.

ii)RCTs can be done at the individual level, where highly select groups of individuals are
randomized under tightly controlled conditions, or they can be done at the community level,
where large groups are randomized (e.g., cities, regions) under less rigidly controlled conditions.
Community trials are usually conducted to test interventions for primary prevention purposes –
so they are prophylactic trials done on a wide scale.

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