Chunk #13 — MATERIALS AND METHODS — Analytic Strategy

Source

Associations of alcohol, nicotine, cannabis, and drug use/dependence with educational attainment: evidence from cotwin-control analyses.

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Pairs of monozygotic (MZ) and dizygotic (DZ) twins were identified as being concordant/discordant on each of the following drug use behaviors: early alcohol use (before age 18), daily nicotine use, lifetime cannabis use, early cannabis use (before age 18), and alcohol, nicotine, cannabis, and any illicit drug dependence.