Chunk #16 — 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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Maximum drinks was assessed with the following question: “What is the largest number of drinks you had on any single day during the past year?” Response options were: (1) 1 to 5, (2) 6 to 9, (3) 10 to 12, (4)13 to 20, and (5) ≥21 drinks/day.