国家儿童发育研究在大范围调查数据中使用了最好的检测智商的方法。

NCDS has the best measure of general intelligence available in any large-scale survey data.

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第三份报告也是斯图鲁斯撰写的，这份在不久前的一个大会上发表的研究报告将多个国家的儿童受体罚较多而平均智商下降的问题联系了起来。

And a third study by Straus, presented at a recent conference, ties nations' high rates of spanking to lower average IQs.

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但可用来进行精确比较的数据却比较缺乏，男女智商的精确对比只能在极少数国家中实施。

The data for making exact comparisons was sparser and could be carried out for only a handful of countries.

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