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In the observational studies we found that some of the B vitamins were beneficial.

在观察性研究中，我们发现一些维生素 B 是有益的。

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In many past observational studies, however, basic genetics or environmental factors could be blamed for this association.

但在以前的许多研究报告中，人们认为基因或环境因素是导致这种联系的元凶。

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So when you put these observational studies together with a 'gold standard' clinical trial, the findings are overwhelming."

VOA: standard.2010.07.21

Now the epidemiology studies are observational studies.

流行病学研究是观察性研究

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"In the observational studies we found that some of the B vitamins, like folic acid,were beneficial."

VOA: standard.2010.06.17

Using publicly available data Reynard researchers will carry out observational studies to establish "baseline normative behaviors".

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Prior big observational studies have conflicted with one another, and other studies weren't ready to be analyzed.

FORBES: Magazine Article

Medical research commonly employs three kinds of study designs: observational studies, randomized controlled trials (RCTs), and metaanalyses.

FORBES: Clinical Trial Advice For Investors From Two Pros