Impact of Medical Conditions on Human IQ Worldwide

  • R. Grant Steen
Part of the The Springer Series on Human Exceptionality book series (SSHE)


We have discussed a range of medical problems that can potentially reduce IQ in the United States in Chap. 9. The estimated average IQ loss per condition in the United States is 9.0 points, and the aggregate number of IQ points lost to a remediable medical challenge is about 389 million points. Assuming that there are 74 million young people in the United States, an average of more than 5 IQ points are potentially at risk per American child. This potential IQ loss could happen despite the availability of high-quality medical care to those who can afford it.


Cerebral Palsy Lymphatic Filariasis Congenital Hypothyroidism Fetal Alcohol Syndrome Bipolar Disorder Patient 
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© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.Medical Communications Consultants, LLCChapel HillUSA

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