Chunk #15 — METHODS — Population Stratification

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CHRNB3 is more strongly associated with Fagerström test for cigarette dependence-based nicotine dependence than cigarettes per day: phenotype definition changes genome-wide association studies results.

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The composition of the samples in terms of self-identified ethnicity was 2,267 European Americans (self-reported “white”), 99 Hispanic Americans, and 999 African Americans (self-reported “black”). Subjects identified as both African American and Hispanic were labeled as African Americans.