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Subjects can only be assigned to a treatment, not to a biological exposure, and it is likely that the biological exposure will vary so little between treatment groups (as observed in the existing literature) to preclude useful conclusions about its effects
Their goal, Romer said, was to see what kinds of drugs they were using, and what the consequences were of their drug use what the predictors are, cognitively and socially. Romer and his colleagues were specifically interested in what researchers called conduct problems. Things like stealing, lying, using drugs without permission by parents, setting fires, skipping school, Romer said
47-2418 Cigarette tax stamps purchased or held prior to effective date
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