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雅思阅读素材——鱼油补充剂也许有助于防癌(2)

2012-12-04 
鱼油补充剂也许有助于防癌

  By contrast, her study is what is known as an observational study, where participants themselves decide, in this case, whether to take a fish oil supplement, and then the researchers observe them to see who develops cancer. But the women who chose to use a supplement could be different in many other ways from those who didn't.

  她的研究方法与此相反,那是一种观察式的研究。由参与者自行选择要不要服用鱼油补充剂。然后研究人员观察她们,注意谁会患癌症。不过,选择服用鱼油补充剂的妇女,也可能和不服用鱼油的妇女,还有许多其它方面的不同。

  White and her colleagues did try to factor those differences into their analysis, but scientists generally prefer a randomized study, and researchers at Harvard are now organizing one to study the effects of both omega-3 fatty acids and vitamin D.

  怀特和她的同事们曾经尝试把各方面的不同因素纳入分析研究。不过,科学家们通常更愿意采用随机研究的方式。哈佛大学的研究人员也正在准备展开对欧米加-3 和维生素D的效果的研究。

  White's paper is published in the journal Cancer Epidemiology, Biomarkers & Prevention.

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