PHQ-9 (Patient Health Questionnaire-9)

Objectifies degree of depression severity.

Over the last 2 weeks, how often have you been bothered by any of the following problems?

Little interest or pleasure in doing things

Feeling down, depressed, or hopeless

Trouble falling or staying asleep, or sleeping too much

Feeling tired or having little energy

Poor appetite or overeating

Feeling bad about yourself — or that you are a failure or have let yourself or your family down

Trouble concentrating on things, such as reading the newspaper or watching television

Moving or speaking so slowly that other people could have noticed? Or the opposite — being so fidgety or restless that you have been moving around a lot more than usual

Thoughts that you would be better off dead, or thoughts of hurting yourself in some way

If any of the above were scored more than "Not at all":

How difficult have these problems made it for you to do your work, take care of things at home, or get along with other people?

Interpretation

Source: Kroenke K, Spitzer RL, Williams JB. The PHQ-9: validity of a brief depression severity measure. J Gen Intern Med. 2001 Sep;16(9):606-13. PubMed PMID: 11556941; PubMed Central PMCID: PMC1495268.
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