Finally, 49.5% of the total sample was affected by at least one class of disorder, but less than half had disorders with severe impairment (27.6%), and only 22.2% exclusive of substance use disorders. Approximately 20% of the sample (40% of all affected individuals) also met criteria for a disorder from at least one additional class. These comorbidity rates were similar for males and females. No age differences were observed for adolescents affected by one class of disorder, but comorbidity with additional classes strongly increased with age.
