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Table 2 Corrected item-total and squared multiple correlations, evaluating each individual item against the total score of the remaining 12 items, in 3 independent samples of 130 subjects (10 subjects per item).

From: Creation and validation of the 4-item BriefPCS-chronic through methodological triangulation

 Corrected item-total correlation (N = 130 each)
Sample 1Sample 2Sample 3
1. I worry all the time about whether the pain will end0.70 (0.60)0.58 (0.50)0.75 (0.59)
2. I feel I can’t go on0.74 (0.62)0.66 (0.57)0.73 (0.61)
3. It’s terrible and I think it’s never going to get any better0.73 (0.67)0.72 (0.69)0.82 (0.74)
4. It’s awful and I feel that it overwhelms me0.84 (0.76)0.80 (0.77)0.81 (0.75)
5. I feel I can’t stand it anymore0.79 (0.71)0.69 (0.62)0.79 (0.69)
6. I become afraid that the pain will get worse0.73 (0.60)0.54 (0.36)0.78 (0.67)
7. I keep thinking of other painful events0.55 (0.49)0.48 (0.34)0.54 (0.40)
8. I anxiously want the pain to go away0.64 (0.58)0.65 (0.49)0.68 (0.59)
9. I can’t seem to keep it out of my mind0.64 (0.58)0.66 (0.58)0.83 (0.77)
10. I keep thinking about how much it hurts0.70 (0.71)0.69 (0.61)0.83 (0.78)
11. I keep thinking about how badly I want the pain to stop0.76 (0.75)0.72 (0.61)0.79 (0.72)
12. There’s nothing I can do to reduce the intensity of the pain0.60 (0.48)0.52 (0.33)0.68 (0.51)
13. I wonder whether something serious may happen0.64 (0.58)0.55 (0.39)0.69 (0.54)
  1. All values are Pearson’s r. Italics: Items that did not reach the a priori threshold for retention of mean item-total correlation at least r = 0.70. Bolded: Items that were retained to move onto Rasch analysis on the basis of either statistical or conceptual considerations