Chunk #3 — METHODS — Measures — Age at first drink

Source

Age at first drink and the first incidence of adult-onset DSM-IV alcohol use disorders.

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AFD was determined by asking respondents how old they were when they first started drinking, not counting small tastes or sips. Because it was highly skewed, AFD was examined as a categorical variable, with ages <15 and 15-17 years compared to ages 18 years or older.