This report lists the numbers of candidates from each of the various countries of origin reported by high-range I.Q. test candidates since the mid-1990s. A household remark: There are a few countries in this table that no longer exist, like "Serbia and Montenegro", "Yugoslavia", and "Netherlands Antilles". If you are reading this and think you are listed as being from one of those but prefer to be on record as originating from a currently extant country, let me know so that it can be altered in the database. Although technically one's country of origin may well be a no longer existing country, in some cases it may be better to specify which current country it concerns.
N = 2826
rnumber of candidates per country × national average I.Q. per country as published by Lynn and Vanhanen: 0.23 (n = 74)
The low but significant correlation with national average I.Q.'s shows that high-range tests tend to draw somewhat more candidates from countries with higher average I.Q.'s. For a proper understanding one should realize that the population sizes of the countries have not been controlled for, so this correlation could be (partly) caused by the larger populations of the countries with higher average I.Q.'s.
In this context, one should also consider the highly significant yet tiny correlation of test scores with national average I.Q.'s as routinely reported in the statistical reports (median r = .05 over 73 tests with a total of approximately 2500 score-country pairs). So, candidates from high-I.Q. countries score only very, very slightly higher than candidates from low-I.Q. countries, but there are more of them. This pattern of correlations is compatible with the following two mechanisms occurring in combination:
This report seems the right place to include the following results, based on national average I.Q.'s reported by Lynn and Vanhanen in past publications, and the estimated national population sizes as per 2022 (Worldometers):
Since especially some countries with low national average I.Q.'s are growing explosively, this world average I.Q. can be expected to drop further.