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Chunk #14 — Methods — Subjects

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The CHRNA5/A3/B4 gene cluster and tobacco, alcohol, cannabis, inhalants and other substance use initiation: replication and new findings using mixture analyses.
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For all analyses, we used subjects with available genetic data. A reduction of the sample size was due to the fact that mixture models are estimated conditional on covariates, hence only subjects with complete genetic data on all ten SNPs are analyzed. Depending on the phenotype, sample sizes were approximately N = 775 in the survival models.