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Change in average fullscale IQ by country, United States, 1909 to 2006

1900201519201940196019802000United States
OurWorldInData.org/intelligence/ •

Source: Pietschnig and Voracek (2015)

Note: The atypical pattern for Brazil may be related to the three relevant studies used, which have comparatively recent time points of second data collection. Some increases in between may thus have
not been captured, with the recent decline in strength of gains potentially masking this pattern. For further detail, see 'sources' and Supplement 1 from Pietschnig and Voracek (2015).

1909
2006

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