An increase of intelligence in Saudi Arabia, 1977-2010

Abstract Normative data for 8–15 year olds for the Standard Progressive Matrices in Saudi Arabia were obtained in 1977 and 2010. The 2010 sample obtained higher average scores than the 1977 sample by .78 d , equivalent to 11.7 IQ points. This represents a gain of 3.55 IQ points a decade over the 33 year period.