Chunk #15 — Methods — Subjects

Source

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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Sex was evenly distributed in the sample. Mean age at the time the phenotypic data were collected was 16.7 (SD = 1.4). Sex was included as covariate in all models to account for potential differences in age of onset.