Table 2 Internal consistency of the K-BDRS
Mean value if item deleted | Scale variance if item deleted | Item-total correlation | Cronbach’s Alpha if item deleted | |
|---|---|---|---|---|
1. Depression | 23.05 | 75.472 | .694 | .851 |
2. Sleep disturbance | 23.51 | 80.036 | .301 | .867 |
3. Appetite disturbance | 23.80 | 78.981 | .353 | .865 |
4. Social impairment | 23.41 | 77.338 | .504 | .858 |
5. Activity/energy reduction | 23.36 | 76.059 | .630 | .854 |
6. Reduced motivation | 23.34 | 77.189 | .569 | .856 |
7. Reduced concentration | 23.66 | 79.047 | .497 | .859 |
8. Anxiety | 23.76 | 75.638 | .636 | .853 |
9. Anhedonia | 23.47 | 76.870 | .615 | .854 |
10. Flattened affect | 24.06 | 79.882 | .391 | .862 |
11. Worthlessness | 23.48 | 75.489 | .635 | .853 |
12. Helplessness | 23.27 | 72.602 | .727 | .848 |
13. Suicidal ideation | 23.82 | 72.795 | .649 | .851 |
14. Guilt | 23.92 | 76.922 | .571 | .856 |
15. Psychotic symptoms | 24.69 | 80.847 | .348 | .864 |
16. Irritability | 24.27 | 83.552 | .171 | .869 |
17. Lability | 24.04 | 81.696 | .254 | .867 |
18. Increased motor drive | 24.78 | 86.404 | −.033 | .874 |
19. Increased speech | 24.86 | 85.893 | .023 | .871 |
20. Agitation | 24.36 | 78.720 | .458 | .860 |