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For example, childhood exposure to lead — associated with homes in poorer areas [82] — correlates with an average IQ drop of 7 points, [83] and iodine deficiency causes a decline, on average, of 12 IQ points. [84] [85] Such impairments may sometimes be permanent, but in some cases they be partially or wholly compensated for by later growth.
Eyferth reported an average IQ of 96.5 for the mixed race children and of 97.2 for the whites. Lynn reduces the former number to 94 to compensate for use of an old test, and compares it, not with the score of the white sample, but with an average IQ of 100 for German children.
This paper suggested that the average IQ score of Ashkenazi Jews fall in a range of 108–115 under some studies, which would be significantly higher than that of any other ethnic group in the world. [15] [17] [18] The paper received widespread coverage in media. [19] [20] [21] The paper attracted significant criticism and controversy.
The United States Census has race and ethnicity as defined by the Office of Management and Budget in 1997. [1] The following median household income data are retrieved from American Community Survey 2021 1-year estimates.
Vanhanen claimed "Whereas the average IQ of Finns is 97, in Africa it is between 60 and 70. Differences in intelligence are the most significant factor in explaining poverty." A complaint by Finland's "Ombudsman for Minorities", Mikko Puumalainen, resulted in Vanhanen being considered to be investigated for incitement of "racial hatred" by the ...
Youngest or middle siblings may beg to differ, but this study of 250,000 Norwegian 18- and 19-year-olds published in Science magazine revealed they had an average IQ 2.3 points higher than their ...
Stressing the similarity of average IQ scores across racial groups in the Eyferth study, James Flynn, Richard E. Nisbett, Nathan Brody, and others have interpreted it as supporting the notion that IQ differences between whites and blacks observed in many other studies are mostly or wholly cultural or environmental in origin. [10]
The 1981 article "Average IQ values in various European countries" by Vinko Buj is the only international IQ study that over a short time period has compared IQs using the same IQ test. Rindermann (2007) states that it is of dubious quality with scant information regarding how it was done. [3] [4]