The Netherlands Twin Register (NTR) consists of individuals who have agreed to participate in twin-family studies and was established and is managed by the Department of Biological Psychology, VU Univ
The Swedish Adoption/Twin Study of Aging (SATSA) is a longitudinal study where the twin design and the inclusion of twins reared apart makes it possible to study the importance of genetic and environm
Table notes: Total N = 7100, in 2376 families. FSIQ = Full-Scale IQ; 17yo = 17-year-old cohort; 11yo = 11-year-old cohort. For a minority of twins (38%), FSIQ represents a within-person average of FSI