Likewise, the Women's Health Study found no significant effect of the vitamin on total cancer incidence or cancers of the breast, lung or colon, nor any effect on cancer deaths.

同样，妇女健康研究发现，维生素对于癌症的总发病率或乳癌、肺癌和结肠癌都没有任何显著的作用，对于癌症死亡也没有任何影响。

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There are no reliable global prevalence figures, but a 2005 study estimated a global incidence of 0.97 per 1000 live births based on research in the United States of America (USA).

目前尚无可靠的全球发病率数据，但2005年的一项研究显示，根据美国的研究，全球的发病率为每1000例活产0.97人。

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While some research suggests that the incidence of childhood obesity may be leveling off, a new study finds that for certain racial groups the rates may actually be getting higher.

当一些调查显示儿童肥胖的发生率可能正趋于平缓时，一项新的调查发现某些种族人群肥胖率可能正变得越来越高。

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In addition,the study revealed that minority children had a higher incidence of HIV/AIDS, sexually transmitted diseases, asthma,certain cancers, and even success rates for treatment of kidney and heart diseases.

VOA: standard.2010.04.07

The study of incidence is the study of whose wallet gets picked.

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One believes any increased incidence of tumours shown in the study is purely the result of the biases.

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However, another more pressing concern was prompted by the 2007 study that found the incidence of colorectal cancer, which had been falling in the US and Canada, rose temporarily just after the vitamin was automatically added to flour.

BBC: Folic acid 'cancer risk' fears played down by study