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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