Chunk #18 — Methods — Target sample from NTR

Source

Polygenic risk scores for smoking: predictors for alcohol and cannabis use?

Embedded

yes

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The target sample consisted of subjects from the Netherlands Twin Register (NTR) who were not part of the TAG meta-analyses. The NTR collects longitudinal data in twin-families (39,40). In total, 8 waves of survey data on personality, health and lifestyle are collected in 1991, 1993, 1995, 1997, 2000, 2002, 2004 and 2009.