METHODS We divided them into intervention groups, control one and health one, among which we interviewed 94 old people with psychological health problems and adopted analysis of paired-t test as well.

方法在黄浦区某社区对94名有心理卫生问题的老年人进行干预前后的配对t检验，并设对照组和心理健康组。

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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

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