Chunk #3 — Sample

Source

Evidence for multiple genetic factors underlying the DSM-IV criteria for alcohol dependence.

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yes

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Zygosity was determined by discriminate function analyses using standard twin questions validated against DNA genotyping in 496 pairs.22 The mean (s.d.) age and years of education of the twins were 36.3 (8.2) and 14.3 (2.2) at the FF4 interview, and 37.0 (9.1) and 13.6 (2.6) at the MMMF2 interview.