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All of the studies ran for at least a year, and all were randomized controlled trials, the most rigorous type of study.
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Two randomized controlled trials in England and the Netherlands have shown that supplementing the diets of young prisoners with omega-3 reduced serious offending by 35%.
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The safety and efficacy of Belviq were evaluated in three randomized, placebo-controlled trials that included nearly 8, 000 obese and overweight patients, with and without type 2 diabetes, treated for 52 to 104 weeks.
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We have a set of plausible and interesting hypotheses to work with, and now we need some randomized controlled trials to give us data we can really use.
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Medical research commonly employs three kinds of study designs: observational studies, randomized controlled trials (RCTs), and metaanalyses.
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The Komen Web site cites a meta-analysis of the the two largest randomized controlled trials, one from China and one from Russia.
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Several studies that followed large groups of people as they aged have suggested that a diet rich in fish is linked to a reduced risk of dementia and mental decline, but most randomized controlled trials comparing DHA supplements with placebo have found no benefit.
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Proponents and skeptics alike agree on the need for data from randomized controlled trials to provide better information to guide use of the new procedure.
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