Chunk #28 — DISCUSSION — Twin Models of Age at First Drink and Problem Alcohol Use

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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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et al., 1994; Knopik et al., 2004; Reed et al., 1996; van den Bree et al., 1998). Also unlike AD, the problem use phenotype in our sample did not share a substantial degree of genetic variance with alcohol use initiation. Our results therefore cannot be used to address this hypothesis, nor can the existing literature, as the heritability of AD in African Americans has not been documented.