Current medical research and opinion
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Randomized Controlled Trial
Limitations of randomized, controlled, double-blinded studies in determining safety and effectiveness of treatments.
Randomized, controlled, double-blinded studies, in which treated subjects are randomly selected from the same pool as controlled (untreated) ones and neither the caregiver nor the patient knows which is which, are widely accepted as the gold standard of experimental medicine. There are well-documented advantages of such studies. ⋯ Some limitations of them are widely known and taught, such as inadequate sample size, failure of proper randomization, et cetera; others are less well-known. We shall focus on the latter.