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Table 3 Inter-rater and test-retest reliability 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)

 

Inter-rater reliability

test-retest reliability

ICC (95 % CI)

p

ICC (95 % CI)

p

1. Depression

0.833 (0.579–0.934)

<0.001

0.770 (0.369–0.794)

<0.001

2. Sleep disturbance

0.948 (0.869–0.980)

<0.001

0.969 (0.883–0.938)

<0.001

3. Appetite disturbance

0.945 (0.861–0.978)

<0.001

0.931 (0.863–0.965)

<0.001

4. Social impairment

0.886 (0.712–0.955)

<0.001

0.904 (0.810–0.952)

<0.001

5. Activity/energy reduction

0.807 (0.512–0.923)

<0.001

0.925 (0.852–0.962)

<0.001

6. Reduced motivation

0.760 (0.393–0.905)

0.002

0.834 (0.671–0.916)

<0.001

7. Reduced concentration

0.759 (0.392–0.905)

0.002

0.903 (0.808–0.951)

<0.001

8. Anxiety

0.780 (0.444–0.913)

0.001

0.825 (0.653–0.912)

<0.001

9. Anhedonia

0.831 (0.573–0.933)

<0.001

0.863 (0.728–0.931)

<0.001

10. Flattened affect

0.847 (0.613–0.939)

<0.001

0.916 (0.835–0.958)

<0.001

11. Worthlessness

0.851 (0.623–0.941)

<0.001

0.882 (0.767–0.941)

<0.001

12. Helplessness

0.851 (0.623–0.941)

<0.001

0.805 (0.613–0.901)

<0.001

13. Suicidal ideation

0.915 (0.785–0.966)

<0.001

0.933 (0.868–0.966)

<0.001

14. Guilt

0.819 (0.543–0.928)

<0.001

0.912 (0.825–0.956)

<0.001

15. Psychotic symptoms

0.936 (0.839–0.975)

<0.001

0.959 (0.918–0.979)

<0.001

16. Irritability

0.919 (0.797–0.968)

<0.001

0.868 (0.739–0.934)

<0.001

17. Lability

0.913 (0.781–0.966)

<0.001

0.823 (0.649–0.911)

<0.001

18. Increased motor drive

0.937 (0.840–0.975)

<0.001

0.920 (0.841–0.959)

<0.001

19. Increased speech

0.791 (0.472–0.917)

0.001

0.919 (0.839–0.959)

<0.001

20. Agitation

0.847 (0.614–0.939)

<0.001

0.861 (0.725–0.930)

<0.001

  1. K-BDRS Korean version of the Bipolar Depression Rating Scale, ICC intraclass correlation coefficient, CI confidence interval