● Between 1997 and 2007, the proportion of substance abuse treatment admissions reporting co-abuse of alcohol and drugs declined from 45.3 to 39.4 percent
● Regardless of which substance was the primary substance of abuse, the most common combinations reported by co-abuse admissions in both 1997 and 2007 were alcohol and marijuana and alcohol and cocaine; however, the proportion of co-abuse admissions reporting alcohol and cocaine decreased between 1997 and 2007, from 51.1 percent to 44.8 percent
● Nearly two thirds of co-abuse admissions had been in treatment at least once before (61.3 in 1997 and 59.6 percent in 2007).
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