All the control group infants responded to the first or second name call at the age of one year, while 86 per cent in the at-risk group did.

所有的对照组的一岁的婴儿对第一次或第二次名字的呼唤均有反应，而风险组的婴儿只有86%反应。

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If individuals on the edge of a group are more vigilant because they are at greater risk of being captured, then individuals on average would have to be more vigilant in smaller groups.

如果处于群体边缘的个体由于被捕获的风险更大而变得更加警惕，那么个体通常在较小的群体中就必须更加警惕。

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But as a group they're at a higher risk for low birth weight, which is associated with obesity, hypertension and type 2 diabetes later in life.

但作为一个群体，他们是出生体重偏低的风险人群，这关联到日后生活中的肥胖、高血压及2型糖尿病罹患率。

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But it isn't clear yet how many of the 7, 000-strong at-risk group have now been fully vaccinated.

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They were scanned again two years later and a fifth of the at-risk group had developed major depression.

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Lead researcher Dr Ronit Peled, from Ben-Gurion University, said that women who had been exposed to a number of negative events should be considered an "at-risk" group for breast cancer.

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