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 |