From 2008 to 2012, about 22.5% of non-institutionalized, civilian adults age 18 and older in the United States had a mental health or addiction disorder during the past year, representing nearly 51.2 million people. About 0.6% of adults experienced psychosis (delusions or hallucinations) during the past year, representing 1.3 million people. About 0.4% of adults had bipolar I disorder during the past year, representing 900,000 people. About 6.0% of adults experienced major depressive disorder, representing 13.8 million people. About 7.8% of adults had a substance use disorder (defined as alcohol . . .