Table 2: Patient Health Questionnaire 9 (PHQ-9) [24].

Over the past two weeks, how often have you been bothered by the following?

Not at allSeveral daysMore than half the daysNearly every day

Little interest or pleasure in doing things0123
Feeling down, depressed, or hopeless0123
Trouble falling or staying asleep or sleeping too much0123
Feeling tired or having little energy0123
Poor appetite or overeating0123
Feeling bad about yourself or that you are a failure or have let yourself or your family down0123
Trouble concentrating on things, such as reading the newspaper or watching television0123
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 usual0123
Thoughts that you would be better off dead or of hurting yourself in some way.0123

If you checked off any problems, 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?

Not difficult at all
Somewhat difficult
Very difficult  
Extremely difficult  

Total score = sum of 9 items.
The PHQ-9 was developed by Drs. Robert L. Spitzer, Janet B.W. Williams, Kurt Kroenke, and colleagues, with an educational grant from Pfizer Inc. PHQ9 Copyright  ©  Pfizer Inc. All rights are reserved.