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Vink, J.M. (author), Boomsma, D.I. (author), Medland, S.E. (author), de Moor, H.M. (author), Stubbe, J.H. (author), Corner, B.K. (author), Martin, N.G. (author), Skytthea, A. (author), Kyvik, K.O. (author), Rose, R.J. (author), Kujala, U.M. (author), Kaprio, J. (author), Harris, J.R. (author), Pedersen, N.L. (author), Cherkas, L. (author), Spector, T.D. (author), Geus, E.J. (author)Physical activity is influenced by genetic factors whose expression may change with age. We employed an extension to the classical twin model that allows a modifier variable, age, to interact with the effects of the latent genetic and environmental factors. The model was applied to self-reported data from twins aged 19 to 50 from seven countries...article 2011
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TNO Preventie en Gezondheid (author), Boomsma, D.I. (author), Beem, A.L. (author), van den Berg, M. (author), Dolan, C.V. (author), Koopmans, J.R. (author), Vink, J.M. (author), de Geus, E.J.C. (author), Slagboom, P.E. (author)In a longitudinal study of Dutch adolescent and young adult twins, their parents and their siblings, questionnaire data were collected on depression, anxiety and correlated personality traits, such as neuroticism. Data were collected by mailed surveys in 1991, 1993, 1995 and 1997. A total of 13 717 individuals from 3344 families were included in...article 2000