Genetic and Environmental Influences on Literacy and Numeracy Performance in Australian School Children in Grades 3, 5, 7, and 9

• Published in: Behavior genetics Vol. 46; no. 5; pp. 627 - 648
• Main Authors: Grasby, Katrina L., Coventry, William L., Byrne, Brian, Olson, Richard K., Medland, Sarah E.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-09-2016; Springer Nature B.V
• Subjects: Adolescent; Australia; Behavior; Behavioral Science and Psychology; Child; Children; Children & youth; Clinical Psychology; Committees; Core curriculum; Education; Employment; Environmental aspects; Environmental factors; Estimates; Female; Gender differences; Gene-Environment Interaction; Genes; Genetic factors; Girls; Grammar; Health Psychology; Heritability; Humans; Language; Literacy; Male; Mathematics; Medical research; Models, Statistical; Multivariate Analysis; Numeracy; Original Research; Phenotype; Psychology; Public Health; Reading; Reading comprehension; Schools; Spelling; Studies; Twins; Writing; Australia; United States > US; Scandinavia; Canberra Australian Capital Territory Australia; Academic achievement; Sex differences; Reading; Generalist genes; Twins; Numeracy
• ISSN: 0001-8244; 1573-3297
• DOI: 10.1007/s10519-016-9797-z

We examined the extent to which genes and the environment contributed to variation in and covariation among reading, spelling, grammar and punctuation, writing, and numeracy in Australian school children in Grades 3, 5, 7, and 9. Heritability was generally high: reading .58–.71 (excepting Grade 5 girls), spelling .68–.78; grammar and punctuation .52–.66, writing .39–.52, and numeracy .39–.79. Boys’ performance varied more than girls in spelling and numeracy, and the common environment was a greater influence in girls than boys in Grade 3 numeracy and Grade 5 reading. Independent pathway models showed similar genetic and environmental structures at each grade with approximately one third to one half of the variation in each domain due to genes that influenced all domains. The covariation among the domains was largely mediated by genes. Results suggest substantial uniformity in the environmental factors influencing these academic domains.