Table 2 Corrected item-total correlations and Cronbach’s α when an item is deleted from the PHQ-9
From: Validation of the Patient Health Questionnaire-9 (PHQ-9) and PHQ-2 in patients with migraine
Corrected item-total correlation | Cronbach’s α if an item deleted | |
|---|---|---|
Item 1 | 0.734 | 0.876 |
Item 2 | 0.667 | 0.881 |
Item 3 | 0.563 | 0.892 |
Item 4 | 0.727 | 0.876 |
Item 5 | 0.713 | 0.878 |
Item 6 | 0.716 | 0.878 |
Item 7 | 0.607 | 0.886 |
Item 8 | 0.607 | 0.887 |
Item 9 | 0.641 | 0.885 |