Table 2.
Items wording and descriptive statistics, and internal consistency of the PHQ-9 and PHQ-2
| Mean | SD | Corrected item total correlation | Alpha if item deleted | Cronbach’s Alpha | |
|---|---|---|---|---|---|
| 1 Little interest or pleasure in doing things | 1.19 | 1.05 | 0.589 | 0.834 | |
| 2 Feeling down, depressed, or hopeless | 1.22 | 1.01 | 0.698 | 0.822 | |
| 3 Trouble falling or staying asleep, or sleeping too much | 1.12 | 1.10 | 0.561 | 0.837 | |
| 4 Feeling tired or having little energy | 1.36 | 1.03 | 0.634 | 0.829 | |
| 5 Poor appetite or overeating | 0.98 | 1.07 | 0.506 | 0.842 | |
| 6 Feeling bad about yourself – or that you are a failure | 0.78 | 1.06 | 0.626 | 0.829 | |
| 7 Trouble concentrating on things | 0.79 | 1.00 | 0.422 | 0.850 | |
| 8 Moving or speaking so slowly that other people could have noticed | 0.68 | 0.99 | 0.597 | 0.833 | |
| 9 Thoughts that you would be better off dead or of hurting yourself | 0.35 | 0.80 | 0.511 | 0.842 | |
| PHQ-9 Total Score | 8.47 | 6.17 | 0.851 | ||
| PHQ-2 Total Score | 2.42 | 1.86 | 0.767 |
SD Standard deviation