Country City Mean IQ Holland Amsterdam 109.4 Germany Hamburg 109.3 Poland Warsaw 108.3 Sweden Stockholm 105.8 Yugoslavia Zagreb 105.7 Italy Rome 103.8 Austria Vienna 103.5 Switzerland Zurich 102.8 Portugal Lisbon 102.6 Great Britain London 102.0 Norway Oslo 101.8 Denmark Copenhagen 100.7 Hungary Budapest 100.5 Czechoslovakia Bratislava 100.4 Spain Madrid 100.3 Belgium Brussels 99.7 Greece Athens 99.4 Ireland Dublin 99.2 Finland Helsinki 98.1 Bulgaria Sofia 96.3 France Paris 96.1

From V. Buj,, Vol. 2, pp. 168 to 169, 1981Subjects >16 yrs. old tested on the Cattell Culture Fair Test 3 (16 SD), standardized in the USA (IQ=100).