Socioeconomic variables can cause differences in regional intelligence levels (for example, wealth which can affect the quality of education, health care and nutrition). Although social scientists have disputes about the accuracy of IQ scores in a given region, regions do vary in terms of their IQ scores.<ref name="CountryIQ">[https://iq-research.info/en/page/average-iq-by-country WORLD RANKING OF COUNTRIES BY THEIR AVERAGE]</ref><ref name="NatureIQ">[http://www.nature.com/hdy/journal/v92/n4/full/6800418a.html Book Review: IQ and the Wealth of Nations], ''Nature''</ref><ref name="AfricanIQ">[https://www.sciencedaily.com/releases/2010/01/100121155220.htm Controversial study of African IQ levels is 'deeply flawed'], Science Daily, January 21, 2010</ref> | Socioeconomic variables can cause differences in regional intelligence levels (for example, wealth which can affect the quality of education, health care and nutrition). Although social scientists have disputes about the accuracy of IQ scores in a given region, regions do vary in terms of their IQ scores.<ref name="CountryIQ">[https://iq-research.info/en/page/average-iq-by-country WORLD RANKING OF COUNTRIES BY THEIR AVERAGE]</ref><ref name="NatureIQ">[http://www.nature.com/hdy/journal/v92/n4/full/6800418a.html Book Review: IQ and the Wealth of Nations], ''Nature''</ref><ref name="AfricanIQ">[https://www.sciencedaily.com/releases/2010/01/100121155220.htm Controversial study of African IQ levels is 'deeply flawed'], Science Daily, January 21, 2010</ref> |