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Table 3 Inter-item correlation matrix for PHQ-9 (major depression disorder)

From: An arabic translation, reliability, and validation of Patient Health Questionnaire in a Saudi sample

PHQ-9 items Item 1 Item 2 Item 3 Item 4 Item 5 Item 6 Item 7 Item 8 Item 9
Little interest or pleasure in doing things 1.000
Feeling down, depressed, or hopeless 0.648 1.000
Trouble falling or staying asleep, or sleeping too 0.431 0.439 1.000
Feeling tired or having little energy 0.553 0.507 0.583 1.000
Poor appetite or overeating 0.397 0.454 0.410 0.468 1.000
Feeling bad about yourself or that you are a failure or have let yourself or family down 0.485 0.578 0.356 0.444 0.445 1.000
Trouble concentrating on things, such as reading the newspaper or watching TV 0.377 0.376 0.345 0.417 0.368 0.398 1.000
Moving or speaking so slowly that other people could have or the opposite? 0.389 0.421 0.290 0.388 0.383 0.403 0.462 1.000
Thoughts that you would be better off dead or of hurting 0.265 0.370 0.177 0.236 0.223 0.347 0.219 0.348 1.000