In a double-blind trial, there were some improvements.

在一个双盲测试中，有了一些进步。

《柯林斯英汉双解大词典》

Design: Randomized, controlled, single blind trial design.

设计：随机对照单盲的实验研究。

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Methods: A randomized, placebo contmlled, double blind trial was used.

方法：采用随机双盲、平行对照临床试验方法。

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It is because the government-funded trial was a placebo-controlled, double-blind, randomized controlled trial.

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In the double-blind, randomized control trial, half the women got tenofovir gel and half got a placebo.

CNN: Gel cuts HIV transmission rate in study

And in a study published last year, researchers in Australia showed in a double-blind, placebo-controlled trial that subjects with suspected gluten sensitivity had substantially fewer symptoms on a gluten-free diet than control subjects who unknowingly ingested gluten.

WSJ: New Guide to Who Really Shouldn't Eat Gluten