Substance use disorders were present in 11.4% of the sample, corresponding to 8.9% of adolescents with drug abuse/dependence and 6.4% with alcohol abuse/dependence. These disorders were somewhat more frequent in males, and a five to eleven-fold increase in prevalence was observed across increasing age groups. The rates for severe substance use disorders were identical to those of the DSM-IV disorders because impairment criteria were embedded in the diagnostic definitions for these disorders. Concerning other conditions, 2.7% of adolescents had manifested eating disorders at some point in their lifetime. These disorders were more than twice as prevalent among females and demonstrated modest increases with age.
