High Maternal Blood Mercury Level Is Associated with Low Verbal IQ in Children

The objective of the present study was to investigate the relationship of IQ in children with maternal blood mercury concentration during late pregnancy. The present study is a component of the Mothers and Children's Environmental Health (MOCEH) study, a multi-center birth cohort project in Korea that began in 2006. The study cohort consisted of 553 children whose mothers underwent testing for blood mercury during late pregnancy. The children were given the Korean language version of the Wechsler Preschool and Primary Scale of Intelligence, revised edition (WPPSI-R) at 60 months of age. Multivariate linear regression analysis, with adjustment for covariates, was used to assess the relationship between verbal, performance, and total IQ in children and blood mercury concentration of mothers during late pregnancy. The results of multivariate linear regression analysis indicated that a doubling of blood mercury was associated with the decrease in verbal and total IQ by 2.482 (95% confidence interval [CI], 0.749–4.214) and 2.402 (95% CI, 0.526–4.279), respectively, after adjustment. This inverse association remained after further adjustment for blood lead concentration. Fish intake is an effect modifier of child IQ. In conclusion, high maternal blood mercury level is associated with low verbal IQ in children.

Pais, educadores e testes: estão de acordo na avaliação de aptidões de crianças pré-escolares? / Parents, teachers and tests: do they agree in the assessment of preschoolers’ abilities?

O presente estudo pretende contribuir para o esclarecimento de questões relativas ao acordo entre pais e educadores quando avaliam o desenvolvimento infantil e com o grau em que estas avaliações estão relacionadas com aptidões cognitivas das crianças. Cento e setenta e três crianças pré-escolares foram classificadas de modo independente por pais e por educadores em diferentes áreas do desenvolvimento e os resultados na WPPSI-R foram tomados como critério externo. A idade e o género das crianças foram considerados nas análises realizadas. O grau de acordo entre informadores revelou-se baixo a moderado. Em comparação com os educadores, os pais classificam os seus filhos como mais desenvolvidos. Algumas dimensões do desenvolvimento (e.g. aprendizagem) encontram-se mais relacionadas com o desempenho na WPPSI-R do que outras. Os resultados são discutidos quanto às suas implicações para a avaliação psicológica de crianças pré-escolares.

This paper addresses issues related to the agreement between parents and teachers when they assess children's development, and to what extend those assessments are related to children's cognitive abilities. A hundred seventy three preschoolers were independently classified by their parents and teachers regarding different developmental domains. The results on the WPPSI-R test were taken as an external criterion to evaluate the accuracy of the parents' ratings. Children's age and gender were considered in the analysis. Inter-rater agreement is low to moderate. Compared with teachers, parents systematically rate their children as more developed. Some dimensions of development (e.g. learning) are more related to performance on the WPPSIR than others. Results are discussed regarding their implications to the psychological assessment of preschoolers.