The study tested the IQ of a group of 8, 000 10-year-old children, and then their diets were assessed 20 years later, when the subjects were 30 years old.
研究测试了一组8000个10岁的小孩的智商，20年后再评估他们的饮食，那时他们已是30岁了。
Even if brain size accounts for just 10 to 20 percent of an IQ test score, it is possible to conjecture what kind of average scores would be made by a group of people with 30 percent larger brains.
即使大脑体积对智商只有一到两成的影响，我们也很容易推测一个脑体积比我们大30%的种族具有怎样的平均智商。
This same group also participated in an IQ test in 1980 as part of their enrollment in the National Longitudinal Survey of Youth.
同样是这群人还曾参加了1980年的一次IQ测试，作为国家青年长期追踪调查项目登记入伍的一部分。
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