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Index values of average hard drug arrests per 10 000 population from 1991 to 2001 and of IDUs aged 15–64 years per 10 000 population aged 15–64 years from 1992 to 2002 in 93 large US metropolitan statistical areas.
Note. IDU = injection drug user. The index for each series was constructed by dividing the mean value for a given year by the mean value for 1992.
