Methods: in a prospective, randomized and controlled trial, 40 patients with acute severe urinary tract infections were divided into two groups.

方法：采用随机对照的实验设计，符合入选标准的40例中、重度泌尿系感染病人进入本研究。

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The study was part of a larger randomized controlled trial conducted in Mexico by researchers from Emory University and local investigators.

该研究是在墨西哥进行的一个更大的随机控制实验的组成部分，研究者是埃默里大学和当地的研究者。

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One of the best ways scientists have to prove cause and effect in medicine is to conduct a randomized controlled trial, in which study subjects are randomly assigned to two groups.

证明药理和药效的最好方法之一就是进行随机临床对照试验，在这个试验中其研究对象会被随机地分成两组。

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In the accepted hierarchy of evidence generation, the results of a randomized, controlled clinical trial usually take precedence over other forms of evidence such as meta-analysis and observational studies.

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In healthcare, our gold standard for good evidence is the randomized controlled trial, in which, for example, half the patients receive a new drug and half receive a placebo.

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The authors noted that there has never been a controlled clinical trial of parachutes, and facetiously suggested that one be conducted in which subjects were randomized to jump from a plane either with or without a device.

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