Chunk #15 — MATERIALS AND METHODS — Data Analysis

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Are there differences between young African-American and European-American women in the relative influences of genetics versus environment on age at first drink and problem alcohol use?

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yes

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All analyses were conducted with singletons as well as complete twin pairs. Although singletons are not informative with respect to the relative contribution of genetic vs. environmental effects, they contribute to estimates of phenotypic variance in twin models.