Millions of Americans suffer from depressions on a yearly basis. In just 2015, approximately 16.1 million Americans, or 6.7 percent of adults in the United States, suffered a major depressive episode according to the National Institute of Mental Health.
The Patient Health Questionnaire (PHQ-9) is a nine part self-assessment tool used to screen for the likelihood of depression, with suggestions for the next step to treatment based on severity.
Disclaimer: The Patient Health Questionnaire is a self-administered version of the PRIME-MD diagnostic exercise for mental disorders. This exercise is not intended to provide specific medical advice. Seek a professional if you think you may be suffering from a medical condition.