College-aged kids are crazy

A psychiatry journal claims:

Results Almost half of college-aged individuals had a psychiatric disorder in the past year. The overall rate of psychiatric disorders was not different between college-attending individuals and their non–college-attending peers. ... These findings underscore the importance of treatment and prevention interventions among college-aged individuals.

Do they really want to treat half of all 20-year-olds? No, I don't believe that DSM-IV disorders are that common. I would have guessed 5% have DSM-IV disorders.