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@StorVoldighed:

For 104 of the 185 nations, no studies were available. In those cases, the authors have used an estimated value by taking averages of the IQs of neighboring

The IQ figures are based on 3 different studies, one study in 34 nations, and two studies in 30 nations. There were actual tests for IQ in 81 nations. For 104 nations there were no IQ studies at all and IQ
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