From V. Buj, Person. & Individ. Diff., Vol. 2, pp. 168 to 169, 1981
Subjects >16 yrs. old tested on the Cattell Culture Fair Test 3 (16 SD), standardized in the USA (IQ=100).
Sweden Stockholm 105.8
3. In Nagoya Japan, the score was 110.24. It was adjusted up by 3.34 points because testing was done on the Canadian Cognitive Abilities Test (see note 1). Source: Takeuchi and Scott (1992) as cited by R. Lynn (1997), Geographical variation in intelligence. In Helmuth Nyborg (Ed.) The Scientific Study of Human Nature. It seems that the Japanese gains have started to level off.