“An Examination of Genotype-Environment Interactions for Academic Achievement in an US National Longitudinal Survey”, 1997 (; similar):
We examined whether genetic and environmental effects on academic achievement changed as a function of the quality of the children’s environment.
The study included a variety of observed environmental measures such as parental cognitive stimulation and poverty level, longitudinal information about previous environmental conditions, and a larger than average number of children who grew up in deprived environments. The sample consisted of 1664 pairs of full siblings, 366 pairs of half siblings, and 752 pairs of cousins who were on average 9.58 years old.
Both a simple descriptive approach as well as statistical-significance tests performed with multilevel regression analyses showed little evidence for genotype-environment interactions. There was only a slight trend consisting of a linear decrease of total variance or nonshared environmental effects from deprived to good environments.