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The present study reports the averaged IQ scores in 21 European countries, collected during a period exceeding
five years. An attempt was made to test a representative sample in all European capitals.
The sample was based on the testing of one person for each 40,000 inhabitants, and the sample may be
considered as stratified because three subgroups of the population were represented proportionally: (1) Men
and women; (2) Age of participants (distribution was into six classes, beginning with the 1620 year olds, and
then going up by 10 year steps to the over 60s); (3) Socio-economic status was also considered, using a threefold
classification.
http://emilkirkegaard.dk/sites/defau...0countries.pdf
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