Observational studies, yes. But no true experiments.

虽然有观察性研究。但没有进行过真正的实验。

Important caveat: this research is just an observational study.

这项研究只是观察性研究。

But these were mostly based on observational studies, which can be misleading.

不过这些结论大多都是在观察研究的基础上的，因而有可能产生误导。

Like studies on animals, large-scale observational studies are not in themselves conclusive.

与对动物的研究一样，大规模的观察性研究本身并不是结论性的。

Actually this type of study, an observational study, is very very common in nutrition research.

实际上，这种观察性研究，在营养研究中非常常见。

An observational study reviewed 7 years of data from calls to Australian poison information center.

一项观察性研究回顾了7年来澳大利亚有毒物情报中心的通话信息数据。

It confirms other observational studies that have not shown a higher risk of heart arrhythmias.

它证实了其它观察性研究并未显示出较高的心律失常风险。

" Observational studies like this always raise the question: Is there something else about tea drinkers that makes them healthier? " said Marion Nestle.

马里恩·内斯特尔说：“像这样的观察性研究总是会提出这样一个问题：喝茶的人是否还有让他们更健康的其他因素？”

But he said that the research was limited to one country and as an observational study does not prove causation.

但他同时表示，这项研究仅限于一个国家，并且作为一项观察性研究，它不能证明任何因果关系。

Suspect harmful compounds in processed meat, and analysis of more than 800 observational studies is what led them to their conclusion.

他们在对八百多项观察性研究的分析后得出了这个结论。

Most nutrition studies are observational studies, which compare health outcomes in people who happen to drink coffee to those who don't.

大多数营养学研究都是观察性研究，将碰巧喝咖啡的人与不喝咖啡的人的健康状况进行比较。

Last Friday, an observational study published in the medical journal The Lancet found a higher mortality rate among patients receiving the drug.

上周五，医学杂志《柳叶刀》上发表的一项观察研究发现，服用该药物的患者死亡率更高。

Before conducting an observational study, researchers must make a number of important decisions, that's about when and where observations will be made.

在进行观察研究之前，研究人员必须做出一些重要的决定，就是关于何时何地进行观察。

Most nutrition studies are observational studies, which compare health outcomes in people who, say, happen to drink coffee to those who don't.

大多数营养学研究是观察性研究，即比较碰巧喝咖啡的人和不喝咖啡的人的健康结果。

And yet, we and others in conducting recent observational studies generally have failed to find a clear association between coffee and arrhythmias.

然而，我们和最近做观察研究的人，都没有发现咖啡和心律失常之间的明确联系。

Ian Johnson, a nutrition researcher at Quadram Institute Bioscience in Norwich, England, praised the " high-quality observational study" for its " robust methods."

英国诺威奇Quadram生物科学研究所的营养学研究员伊恩·约翰逊称赞了这项“高质量的观察性研究”及其“稳健的方法”。

And new observational studies were finding that quickly digestible carbohydrates and added sugars were independently associated with an increased risk of heart disease.

最新观察到，易消化的碳水化合物再加上糖可能是增加心脏疾病的罪魁祸首。

An observational study reviewed 7 years of data from calls to the Australian Poison Info. Center.

一项观察性研究审查了 7 年来来自澳大利亚毒物信息中心的电话数据。中心。

Through interviews and observational studies in these communities, I documented the daily income flows for micro-entrepreneurs.

通过对这些社区的采访和观察研究， 我记录了微型企业家的日常收入流向。

It was an observational study. In a controlled study, some patients would have taken aspirin.

这是一项观察性研究。在一项对照研究中，一些患者会服用阿司匹林。