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。

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Previous studies have found that more optimistic people have a lower risk of developing chronic diseases, and a lower risk of premature death.

之前的很多研究已经发现，越乐观的人得慢性病的风险越低，过早死亡的风险也越低。

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Many studies have found that a basic form of learning called conditioning can happen during sleep.

许多研究发现，一种被称为条件反射的基本学习形式可以在睡眠中发生。

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Studies have found that nicotine can be as difficult to resist as alcohol or the drug cocaine.

VOA: special.2010.03.09

Two recent studies have found that punishment is not the best way to influence behavior.

VOA: special.2009.10.21

Studies have found that aspirin may help prevent cancers of the stomach, intestines and colon.

VOA: special.2009.10.20

Some studies have found an increased risk of breast cancer, but others found no connection.

CNN: Gaps found in young people's sex knowledge

However, the findings do dovetail with what other interventional studies have found, experts say.

CNN: Experts reveal best ways to save an aging brain

Other studies have found divorce to have little or no impact on suicide risk.

ECONOMIST: Why do so many young Americans end their own lives?