Presence, while depressed, of two or more of the following:
1) poor appetite or overeating,
2) insomnia or hypersomnia,
3) low energy or fatigue,
4) low self-esteem,
5) poor concentration or difficulty making decisions, or
6) feelings of hopelessness.

American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders. 5th ed. Washington, DC. American Psychiatric Association. 2013. Internet. Accessed on June 21, 2017.