“Genetic and Environmental Influences on Adult Life Outcomes: Evidence from the Texas Adoption Project”, 2007-03-13 ():
A short mail questionnaire was sent to individuals, now adults, who had been studied over 30 years ago as children in the Texas Adoption Project. Their parents and (in many cases) siblings also described them using the same questionnaire, and the parents described themselves as well. The questionnaire was designed to obtain information about educational, occupational, and marital outcomes, as well as adult problems and personality.
Results: were obtained for 324 adopted and 142 biological children from the original 300 families, and for 266 parents.
Although both the adopted and biological offsprings’ outcomes were generally positive, those for the adopted offspring were somewhat less so. Biologically related family members tended to be more similar in their life outcomes than biologically unrelated family members, suggesting that genes were playing an important role.
[Keywords: adoptions = life outcomes = genes = environment = personality traits]
Table 9: Results from fitting Figure 2 model—estimates of one genetic and 2 environmental variance components. Note: p2 = parental influence, h2 = additive effect of genes, c2 = shared environment of siblings, other than parents’ trait. See Figure 1 for full rating scales. Rating scale p2 h2 c2 High level of education 0.01 0.33 0.14 Excellent student in HS 0.01 0.21 0.05 Many friends in HS 0.02 0.46 0.09 Never in trouble in HS 0.00 0.12 0.06 Distant from father 0.10 0.45 0.28 Distant from mother 0.10 0.06 0.20 Job responsibility 0.01 0.31 0.13 Job stability 0.00 0.56 0.02 Marital status 0.00 0.22 0.10 Stable, happy marriage 0.00 0.31 0.09 Drug or alcohol problem 0.00 0.34 0.00 Anxious or depressed 0.03 0.21 0.05 In trouble with the law 0.00 0.01 0.08 Lots of friends & social activity 0.00 0.31 0.24 Independent, self-reliant 0.00 0.73 0.08 Mature, helpful 0.03 0.21 0.05 Conscientious, reliable 0.01 0.47 0.08 Pleasant, agreeable 0.02 0.07 0.04