Chunk #12 — 2. Methods — 2.2. Measures — 2.2.5. Zygosity

Source

Risks for early substance involvement associated with parental alcoholism and parental separation in an adolescent female cohort.

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yes

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Zygosity was coded from parent and twin responses to standard questions regarding twin similarity and the degree to which twins were confused by others (Nichols and Bilbro, 1966).