There was a marked difference between the positive rate of the ventricular late potentials(VLP) in COPD group and control group( P< 0.01).

COPD组与对照组心室晚电位（VLP）阳性率比较有显著性差异（P＜0．01）。

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METHODS: a randomized, positive control, the 233 cases were divided into treatment group (116 cases) and drug group (117 cases).

方法：采用随机、阳性药物对照、将233例分为治疗组(116例)和药物组(117例)。

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But in control group, positive rate was only less than 5%, and we could only see a single normal DNA strip.

对照细胞呈现阳性染色者每视野不超过5%，DNA凝胶电泳只见一条正常基因组dna带。

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And that group did much better on the learning task than the control group, because they were put into a positive mood.

第二组,在学习任务上比对照组表现更好，因为他们被置于积极情绪。

哈佛公开课 - 幸福课课程节选

Last week, two studies from Sweden found that one hour a week of hypnotherapy for 12 weeks eased symptoms of irritable-bowel syndrome in 40% of patients (compared with 12% in a control group) and that the positive effects can last as long as seven years.

WSJ: Medical Hypnosis: You Are Getting Very Healthy