Crack cocaine trajectories among users in a midwestern American city.

Abstract

AIMS Although crack cocaine first appeared in cities in the United States in the mid-1980s, little is known about its use over long periods of time. This study identified crack cocaine user groups on the basis of long-term trajectories. DESIGN Following a natural history approach, data were collected periodically from 1996 to 2005. Group-based modeling… (More)

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