Randomized Controlled Trial

Randomized Controlled Trial

A randomized controlled trial (RCT) (or randomized comparative trial) is a specific type of scientific experiment, and the gold standard for a clinical trial. RCT are often used to test the efficacy of various types of intervention within a patient population. RCT may also provide an opportunity to gather useful information about adverse effects, such as drug reactions.

The key distinguishing feature of the usual RCT is that study subjects, after assessment of eligibility and recruitment, but before the intervention to be studied begins, are randomly allocated to receive one or other of the alternative treatments under study. Random allocation in real trials is complex, but conceptually, the process is like tossing a coin. After randomization, the two (or more) groups of subjects are followed in exactly the same way, and the only differences between the care they receive, for example, in terms of procedures, tests, outpatient visits, follow-up calls etc. should be those intrinsic to the treatments being compared. The most important advantage of proper randomization is that it minimizes allocation bias, balancing both known and unknown prognostic factors, in the assignment of treatments."

The terms "RCT" and randomized trial are often used synonymously, but some authors distinguish between "RCTs" which compare treatment groups with control groups not receiving treatment (as in a placebo-controlled study), and "randomized trials" which can compare multiple treatment groups with each other. RCTs are sometimes known as randomized control trials. RCTs are also called randomized clinical trials or randomized controlled clinical trials when they concern clinical research; however, RCTs are also employed in other research areas, including many of the social sciences, where their relevance and the advantages claimed for them have been contested in the literature.

Read more about Randomized Controlled Trial:  History, Ethics, Randomization, Blinding, Analysis of Data From RCTs, Reporting of RCT Results, Advantages, Disadvantages, Randomized Controlled Trials in The Social Sciences

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... Since better quality trials have become available, the evidence for efficacy of homeopathy preparations has diminished the highest-quality trials indicate that the ... and Publication bias The fact that individual randomized controlled trials have given positive results is not in contrast with an overall lack of statistical evidence of efficacy ... A small proportion of randomized controlled trials inevitably provide false-positive outcomes due to the play of chance a "statistically significant" positive outcome is commonly ...
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... for reduction of drinking among biologically predisposed alcoholic patients a randomized controlled trial ... treatment of alcohol dependence a randomised controlled trial ... of life of alcohol-dependent individuals a randomized controlled trial ...

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