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. 2016 Mar 15;11(3):e0151042. doi: 10.1371/journal.pone.0151042

Table 2. Item analysis of PHQ-9.

PHQ-9 items Item-total correlation Cronbach's alphaif item is deleted
(1) Little interest or pleasure in doing things 0.61 0.80
(2) Feeling down, depressed, or hopeless 0.72 0.78
(3) Trouble falling or staying asleep, or sleeping too much 0.69 0.81
(4) Feeling tired or having little energy 0.68 0.80
(5) Poor appetite or overeating 0.56 0.81
(6) Feeling bad about yourself—or that you are a failure 0.52 0.81
(7) Trouble concentrating on things 0.45 0.82
(8) Moving or speaking so slowly that other people could have noticed 0.47 0.81
(9) Thoughts that you would be better off dead or of hurting yourself 0.45 0.81