Chunk #13 — MATERIALS AND METHODS — Measures

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Measures of current alcohol consumption and problems: two independent twin studies suggest a complex genetic architecture.

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Frequency was assessed by the following question: “In a typical month over the last year, how often do you drink alcohol?” Response options included: (1) 1 to 3, (2) 4 to 9, (3) 10 to 15, (4) 16 to 27, and (5) 28 to 30 days per month.