The JAMA study isn't the first to study a link between nursing and intelligence, but researchers say it is more conclusive because of its size and how it has isolated variables such as the mother's IQ and the child's upbringing. Previous studies have had difficulty adjusting for other factors that might influence a child's IQ, were limited by their small size or didn't account for length of nursing, said Mandy Belfort, the JAMA study's lead author and assistant professor of pediatrics at Harvard Medical School.
这项发表在JAMA的研究并不是最早将母乳喂养与智商水平联系在一起的研究,但研究人员称它的实验样本大,而且它还排除了婴儿母亲的智商及孩子接受的教育等变量,因此更加让人信服。该研究的第一作者、哈佛医学院(Harvard Medical School)的儿科学助理教授曼迪•贝尔福特(Mandy Belfort)指出,以往的研究在对可能影响孩子智商的其他因素进行调整方面存在问题,而且它们的实验样本较小,或是未考虑到母乳喂养期的时间长短。
The latest study examined and rated each child's environment based on factors such as how many books are available, and gave each mother an IQ test. They also asked detailed questions about factors that might influence IQ, such as child care, income and parental education. They then subtracted those factors using a statistical model. Dr. Belfort said she hopes that 'what we have left is the true connection' with nursing and IQ.
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