Chunk #21 — MATERIALS AND METHODS — Measures — Demographic Covariates

Source

The effects of age at drinking onset and stressful life events on alcohol use in adulthood: a replication and extension using a population-based twin sample.

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Age at interview, current marital status (coded as married or not), years of education (truncated at 20), and household income (truncated at $200,000) were included as covariates in the analyses.