At 5 years of age, 249 children were given an intelligence test known as the Wechsler Preschool and Primary Scale of the Intelligence, which provides verbal, performance and full-scale IQ scores.

• 249名儿童在5岁时，接受名为韦氏学龄前儿童智力量表的智力测试，测试可以提供语言、表现和全面的智商分数。