More than 60% of a sample of 5,639 participants with clinician-identified depression (drawn from the 2009-10 US National Survey of Drug Use and Health) did not actually meet criteria for major depression, a study from the Bloomberg School of Public Health and Johns Hopkins University found.
Mojtabai, R., Clinician-Identified Depression in Community Settings: Concordance with Structured-Interview Diagnoses. Psychotherapy and Psychosomatics 82 (3) 161-169. Issue release April 2013.
Of further interest:
Study: Most People Diagnosed With Depression Do Not Actually Meet Criteria (The Atlantic)
Over-diagnosis and over-treatment of depression is common in the US (MedicalXpress)