But fifteen percent of those taking the placebo and aspirin had them.

VOA: special.2009.10.20

They had to give some of them the real vaccine and some of them a placebo vaccine in order that they could really tell if the vaccine worked; you have to have it placebo controlled.

研究者们还须给部分孩子接种真正的疫苗,给另外一些孩子接种空白疫苗,以分辨疫苗是否真的有效,所以你必须使用安慰剂作对照

耶鲁公开课 - 生物医学工程探索课程节选

So, you didn't know at the beginning, you knew you were enrolled in the trial, they gave you a shot, you didn't know whether you were part of the real group that got the test vaccine or the placebo group that got the control; turned out that Bonnie was part of the control group.

一开始你可能不清楚全过程,你只知道你参与了一项试验,他们给你打了一针,你不知道你是属于接种了,试验疫苗的真实试验组,还是属于被注射了安慰剂的空白对照组,结果显示,邦妮属于对照组

耶鲁公开课 - 生物医学工程探索课程节选

Seventy-four people in the placebo group became infected during the study.

VOA: special.2009.10.13

Others would have received a placebo sugar pills -- for comparison.

VOA: special.2009.09.01

The other half received a placebo, an inactive substance.

VOA: special.2009.09.30

In the placebo group, seventeen percent had these ulcers.

VOA: special.2009.10.20

It was only a placebo, a harmless substance.

VOA: special.2009.10.20

It was properly powered,randomized and placebo-controlled and really provides evidence for the use of oxygen in cluster headaches,"

VOA: standard.2009.12.17

Half of the overall test group of more than 16,000 people received the doses, while the other 8,000 people in the trial received a placebo.

VOA: standard.2009.10.20

"Twenty percent of attacks were improved on placebo,which is air, and 78 percent of attacks were improved on oxygen, a clear difference in favor of oxygen,"

VOA: standard.2009.12.17

Jay Fournier, the study's lead author, "What we found was that patients who are on the lower end of the severity, the medications weren't doing much more than the placebo was.

VOA: standard.2010.01.08

Some were given antidepressants. Others received a placebo.

VOA: standard.2010.01.08

"If you look at the large studies, that were published over the last several years, including a large number of patients comparing Avandia to a placebo or other drugs, there was actually no increase in that risk.

VOA: standard.2010.03.02