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。

youdao

Are there alternatives to epidemiological studies?

除了流行病学研究，还有其他的吗？

youdao

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。

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"Now,with large epidemiological studies done everywhere including here, we can say with a great level of confidence that the disease affects roughly the same percentage of the general public worldwide.

VOA: special.2010.11.16

Hope Ferdowsian of the Physicians Committee says "For example,in HIV research, we've learned a lot from human epidemiological studies and ethically conducted clinical trials."

VOA: standard.2010.02.16

The first clinical and epidemiological studies linking cigarette-smoking and lung cancer were published only in 1950.

ECONOMIST: Tobacco

The manufacturer says it's working on two epidemiological studies, but wouldn't give further details.

NPR: FDA Orders Label For Contraceptive Patch

So far, a number of epidemiological studies have not found evidence that they do.

ECONOMIST: Scientific justice