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Table 2 Internal consistency of the K-BDRS

From: Clinical assessment of bipolar depression: validity, factor structure and psychometric properties of the Korean version of the Bipolar Depression Rating Scale (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
  1. K-BDRS Korean version of the Bipolar Depression Rating Scale