China IQ Map

China IQ Map China Map
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February 26, 2015
China - Others
by @JamesMurray001
Comments Surveillance on iodine deficiency disorders in China in 2005: an analysis of intelligence test. Abstract:Objective To study children's intelligence after universal salt iodization (USI) had been implemented for 10 years in China. Methods The children of 8 to 10 years were sampled by population proportion sampling method. The samples were divided into groups according to the province, age, sex, urine iodine. Intelligence quotient (IQ) values were measured by the combined Raven's Test in China (CRT-C2). Results The mean IQ of children was 103.4, being 103.4 and 102.0 respectively for boys and girls after USI had been performed for 10 years in 32 provinces, children with IQ values less than or equal to 69 accounted for 4.4% of the population. Children with IQ lower than the average level distributed in the provinces where the USI was not well implemented. Children with adequate iodine contents had the highest IQ (103.8), and IQ decreased obviously when the children was iodine-deficient (98.7). There was no significant difference of averaged IQ between children with excessive and adequate iodine. Conclusions Iodine deficiency significantly affects intelligence development of children aged 8 - 10 years old, indicating that it is correct and effective to implement the strategy of putting iodine into edible salt to control iodine deficiency disorders in non-iodine-excessive endemic areas in China; iodine excess has no obvious influence on intelligent development of the children aged 8 - 10 years in non-iodine-excessive areas; with the improvement of living quality, developing level of children's intelligence in our country is elevated in the recent decades, so it is necessary to revise the present IQ norm of CRT-C2.

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