Chunk #20 — Methods — Target sample from NTR

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

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yes

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Glasses alcohol per week: Answer options: <1 glass, 1–5 glasses, 6–10 glasses, 11–15 glasses, 21–40 glasses, > 40 glasses. When longitudinal data were available we used the highest number of glasses reported in all available data (survey 2–8). No survey data on alcohol use were available for 203 subjects.