‘Over the past 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/being so restless that it is hard to sit still. Thoughts that you would be better off dead or of hurting yourself in some way.

Response options:

Not at all (coded as 0)  Several days (coded as 1)  More than half the days (coded as 2)  Nearly every day (coded as 3)