Chunk #17 — MATERIALS AND METHODS — Statistical Analyses — ALSPAC:

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Polygenic contributions to alcohol use and alcohol use disorders across population-based and clinically ascertained samples.

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In keeping with standard practice for genetic analyses in ALSPAC, sex and 10 ancestral principal components were included as covariates. ALSPAC assessments are age-specific, therefore age was not included as a covariate.