Epidemiological studies have found that children with PDD have no higher prevalence of gastrointestinal tract than normal children.
流行病学研究发现，广泛性发育障碍（Pervasive Developmental Disorder）孩子和正常孩子相比较并没有更高的胃肠道患病率。
Are there alternatives to epidemiological studies?
除了流行病学研究，还有其他的吗？
To be effective, we need more epidemiological studies.
为了使预防更有效，需要更多流行病学研究。
According to epidemiological studies, that appears to be the case.
根据流行病学研究，情况就是如此。
We count nearly 50 published epidemiological studies since 1957 reporting a link.
我们统计到自1957年以来出版的近50个流行病研究报道过这一关联。
But the most comprehensive data would be from some of the large epidemiological studies.
但是，最复杂的数据可能来自大量的流行病研究。
Epidemiological studies have shown the higher winter mortality particularly in older age groups.
流行病学研究表明，在冬季老年人群中会出现过高的死亡率。
Epidemiological studies report that regular physical activity can reduce the risk for cancer development.
许多流行病学的研究都显示运动能减少肿瘤发生的风险。
Epidemiological studies by field staff demonstrated that smallpox did not spread so rapidly as textbooks suggested.
现场工作人员所做的流行病学研究表明，天花蔓延并没有如书本所述那样迅速。
The first clinical and epidemiological studies linking cigarette-smoking and lung cancer were published only in 1950.
对吸烟与肺癌相关性的临床和流行病学研究结果也直到1950年才首次公布于众。
But epidemiological studies, which find statistical associations between sets of data, do not prove cause and effect.
可是流行病学的研究发现，几组资料在数据方面有所关联，却没有证实其因果关系。
Epidemiological studies look at a large group of people who have been exposed to a substance suspected of causing harm.
流行病学研究对暴露于某种怀疑造成危害本体的大群人进行观察。
Epidemiological studies give evidence to prove that Cruciferous vegetables (CFV) have anticancer and antitumor effects.
流行病学研究表明辣根及其它十字花科蔬菜(CFV)具有抗癌症和肿瘤的作用。
Numerous epidemiological studies have found and association between the incidence of oral cancers and betel nut chewing.
从流行病学研究指出，口腔癌的发生与嚼食槟榔有密切关系。
“During the last 21 months, four epidemiological studies and one review reported an abortion-breast cancer link,” she noted.
在过去的21个月中，有四个流行病研究和一个评论报道指出了堕胎和乳癌的关联。
"During the last 21 months, four epidemiological studies and one review reported an abortion-breast cancer link," she noted.
在过去的21个月中，有四个流行病研究和一个评论报道指出了堕胎和乳癌的关联。
In two very large prospective epidemiological studies, drinking coffee was associated with a lower risk of death by all causes.
在两大前瞻性流行病研究中，喝咖啡能降低各种原因的死亡率。
Such approach calls for integrated topic teaching rather than the isolated presentation of the findings of epidemiological studies.
像这样的一个思路，就不是孤立地展示流行病研究所见，而要求我们提出课题的整体指导。
But epidemiological studies, which find statistical associations between sets of data human hair wigs, do not prove cause and effect.
可是流行病学的研究发现，几组资料在数据方面有所关联，却没有证实其因果关系。
Epidemiological studies have suggested that the increase of uric acid level has a direct correlation with the risk of ischemic stroke.
流行病学研究提示，尿酸水平升高与缺血性卒中风险有直接关系。
But epidemiological studies have found no higher prevalence of gi problems among children with PDD compared to normally developing children.
但是，流行病学研究发现，pdd孩子和正常孩子相比较并没有更高的胃肠道患病率。
There have been few epidemiological studies to validate such claims, but the scale of such reports highlights the growing fear of pollution.
目前还没有流行病学研究对这些说法进行认证，但是大量的报导加剧了人们对污染的恐惧。
Recent epidemiological studies have found no convincing evidence of an increased cancer risk or any other disease with mobile phone use.
最近的流行病学调查未发现有令人信服的证据证明使用移动电话能够增加癌症的风险或任何其它疾病。
Epidemiological studies have shown that symptoms of bronchitis in asthmatic children increase in association with long-term exposure to NO2.
流行病学研究表明，哮喘儿童发生支气管炎症状的增多与长期接触二氧化氮有关。
We included in the analysis 17 articles that met our basic quality criteria: 5 randomized human laboratory trials and 12 epidemiological studies.
5篇关于随机人体实验室试验,12篇关于流行病学研究。
Scientific evidence on the distribution of cancer in the population can be obtained through carefully planned and executed epidemiological studies.
通过慎重计划和开展的流行病学研究，可获得关于癌症在人群中分布情况的科学依据。
Recent epidemiological studies suggest the emergence of resistant strains of candida as well as mycelial fungi other than Aspergillus in these patients.
近来的流行病学研究表明：在这些患者中，除有曲霉菌感染外，尚出现耐药型念珠菌和丝状真菌感染。
Recent epidemiological studies suggest the emergence of resistant strains of candida as well as mycelial fungi other than Aspergillus in these patients.
近来的流行病学研究表明：在这些患者中，除有曲霉菌感染外，尚出现耐药型念珠菌和丝状真菌感染。
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