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Table 3 Comparison of internal consistency among subscales (n = 151)

From: Evaluating psychometric properties of the Short Form Brief Pain Inventory Sinhala Version (SF BPI-Sin) among Sinhala speaking patients with cancer pain in Sri Lanka

BPI Items Cronbach’s alpha
Two factors Three factor 1 Three factor 2
Item total correlation Alpha if item deleted Item total correlation Alpha if item deleted Item total correlation Alpha if item deleted
  Severity (alpha = 0.819) Severity (alpha = 0.819) Severity (alpha = 0.819)
Worst pain 0.637 0.776 0.637 0.776 0.637 0.776
Least pain 0.477 0.839 0.477 0.839 0.477 0.839
Average pain 0.781 0.710 0.781 0.710 0.781 0.710
Pain now 0.698 0.745 0.698 0.745 0.698 0.745
  Interference (alpha = 0.868) Activity (alpha = 0.829) Activity (alpha = 0.813)
General activity 0.664 0.847 0.644 0.803 0.645 0.760
Walking ability 0.631 0.857 0.669 0.806 0.659 0.759
Normal works 0.796 0.829 0.784 0.683 0.777 0.704
    Affective (alpha = 0.789)   
Sleep 0.571 0.859 0.567 0.759 0.487 0.828
      Affective (alpha = 0.759)
Relationships with others 0.534 0.863 0.476 0.796 0.492 0.790
Enjoyment of life 0.680 0.847 0.713 0.685 0.665 0.593
Mood 0.691 0.845 0.664 0.706 0. 621 0.640
  1. The items which increase the alpha values ‘if deleted,’ more than the subscale values were indicated with bold numerals