Chunk #14 — 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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Regular quantity was assessed with the following question on drinking habits in the past year: “On those days when you drank, how many drinks did you usually have in a day?” Response options included: (1) 1 to 2, (2) 3, (3) 4 to 5, (4) 6 to 9, and (5) ≥9 drinks/day.