Table 1 PHQ-9 item level values and item-total correlations (n = 924)
From: Reliability and validity of the Thai version of the PHQ-9
PHQ-9 item | Mean | SD | Corrected item-total correlation | Alpha if item deleted |
|---|---|---|---|---|
1. Little interest or pleasure in doing things | 0.67 | 0.66 | 0.54 | 0.76 |
2. Feeling down, depressed, or hopeless | 0.61 | 0.69 | 0.61 | 0.75 |
3. Trouble falling or staying asleep, or sleeping too much | 0.92 | 0.87 | 0.48 | 0.77 |
4. Feeling tired or having little energy | 0.88 | 0.83 | 0.56 | 0.76 |
5. Poor appetite or overeating | 0.67 | 0.78 | 0.45 | 0.78 |
6. Feeling bad about yourself – or that you are a failure | 0.30 | 0.58 | 0.48 | 0.77 |
7. Trouble concentrating on things | 0.48 | 0.68 | 0.45 | 0.77 |
8. Moving or speaking so slowly that other people could have noticed | 0.30 | 0.55 | 0.45 | 0.78 |
9. Thoughts that you would be better off dead or of hurting yourself | 0.09 | 0.34 | 0.35 | 0.79 |