Quality of education greatly influences IQ scores, i.e. a lower average IQ is more indicative of lower access to wide-scale quality education rather than innate intelligence (see my explanation of the issue). Also, testing conditions influence results; wealthier countries are more likely to be able to afford better testing conditions for participants.
Please note that the data, collected by Lynn and Vanhanen in 2012, may be outdated for some countries. Because of inevitable statistical and sampling errors, isolated figures must be taken with a grain of salt, and the fact that one country is a few points above or below another should not be taken as a proof of the real average IQ in that country being lower.
Before using strong words in the comments, please consider:
My intention with the map wasn’t to praise or ridicule any particular country (I didn’t know the numbers beforehand). I just created a visualization of statistical data based on a highly-cited scientific paper, just like I have done for dozens of other maps.Lower access to quality education anywhere in the world is in no one’s interest (maybe apart from politicians and companies wanting to control people). The correct question we should ask therefore is: What can we, the European society, do to help countries with worse performing education systems?
Data by Lynn, Vanhanen (2012)
The following map is based on a book entitled Intelligence: A Unifying Construct for the Social Sciences by Lynn and Vanhanen. The number for Andorra (in parentheses) is merely an estimate based on demographics rather than actual measurements.
Lynn and Vanhanen used not only IQ measurements available in the respective countries but also, to a great degree, various standardized student assessment studies and known correlations between IQ and results of such studies.
(Please note that Lynn and Vanhanen made a typographical error in the case of Bosnia in their book, which is corrected in the map.)
It is also not without interest what the map looks like when the raw IQ data is not adjusted using student assessment studies. N/A means that the IQ shown above was based solely on student assessment studies:
To be able to better compare the maps, you can see the difference in the following picture:
The original [outdated!] map: Rindermann (2007)
Note: Since the maps above are based on more recent data, the map shown here should be considered outdated. The map is based on statistical data contained in the 2007 paper “The g-Factor of International Cognitive Ability Comparisons” by H. Rindermann. Rindermann used available IQ measurements and other available testing data in various countries, normalized the data using the so called “Greenwich IQ”, i.e. setting UK = 100, and then applied certain adjustments to estimate the average IQ of the whole population.
UPDATE for Croatia: As was pointed out by one of my readers, although Rindermann used data on Croatia from a relatively recent paper, the paper in turn used data several decades old, which I wasn’t aware of while creating the map. The caption for Croatia has been changed to N/A as there is no up-to-date data source for it consistent with the rest.
Note: Kosovo is understood as a part of Serbia and Crimea as a part of Ukraine for the purposes of these statistics. Rindermann estimated data for several countries, which were originally in the map but are now set to N/A because the map above provides actual data, so the estimates are now worthless.
The underlying blank map was made by Tindo and licensed from fotolia.com. If you want to share the maps, please share a link to this webpage instead of sharing just the pictures.