Chunk #14 — Materials and methods — Study 3 — Participants and procedures

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Differential susceptibility in youth: evidence that 5-HTTLPR x positive parenting is associated with positive affect 'for better and worse'.

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Participants (N=1370, 53% girls and 86% from the Dutch ancestry) came from the Dutch prospective cohort study TRAILS.46, 47 Data from the first, second and third wave were used, at ages 11.09 (s.d.=0.59), 13.55 (s.d.=0.54) and 16.13 (s.d.=0.59), respectively. All procedures have been approved by the Central Committee on Research Involving Human Subjects. Both participants and their parent signed informed consent before participation. The participants filled out questionnaires at school, under the supervision of TRAILS assistants.