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Prospective population based cohort study.
Christchurch, New Zealand; 1992–2002.
1265 young people born in 1977 and recruited into the Christchurch Health and Development Study (Maori: 11%; completed secondary education: 91%).
At age 15, 16, 18, 21, and 25 years, participants were questioned about illicit drug use including cannabis, solvents, hallucinogens, barbiturates, amfetamines, opiates, cocaine, illegally obtained prescription medications, and plant extracts such as Datura and magic mushrooms. Drug dependence was assessed at age 16, 18, 21, and 25 years based on DSM-IV criteria. Adolescent behaviours, peer affiliations, individual characteristics, and family social background and functioning were assessed to identify risk factors …
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