The ethnic make-up was 554 whites and 292 Chicanos, with 265 females and 581 males. The majority began using narcotics between ages 17 and 25. More than half did not finish high school. The data was collected between 1978 and 1982. The data, say the authors, is arguably the best of its kind available in the world.
Trends identified in the data remain current today, say the researchers.
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