Thou should in fact basically copy his work, and then publish it in The Lancet, and then not cite him, or Heiner Rindermann, or David Becker, or Gerhard Meisenberg -- in fact, best not to cite any wrong-thinker at all.
There's a 2009 study based on a BBC survey of 53 nations' spatial ability. Ultimately having ~200k participants. Finland appears to have done the best, Pakistan (folowed by India) the worst.
The Cohens D between the sexes is reported, internationally, not by nation. One could perhaps roughly work out the SDs between nations as a result, as they report male and female scores by country.
They also note correlations with Per capita income, yielding .65 for the rotation test, and .5-.3 for the line judgement test.
There's a 2009 study based on a BBC survey of 53 nations' spatial ability. Ultimately having ~200k participants. Finland appears to have done the best, Pakistan (folowed by India) the worst.
The Cohens D between the sexes is reported, internationally, not by nation. One could perhaps roughly work out the SDs between nations as a result, as they report male and female scores by country.
They also note correlations with Per capita income, yielding .65 for the rotation test, and .5-.3 for the line judgement test.
https://link.springer.com/article/10.1007/s10508-008-9460-8