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 1 | Sample 2 | Sample 3 | |
1. I worry all the time about whether the pain will end | 0.70 (0.60) | 0.58 (0.50) | 0.75 (0.59) |
2. I feel I can’t go on | 0.74 (0.62) | 0.66 (0.57) | 0.73 (0.61) |
3. It’s terrible and I think it’s never going to get any better | 0.73 (0.67) | 0.72 (0.69) | 0.82 (0.74) |
4. It’s awful and I feel that it overwhelms me | 0.84 (0.76) | 0.80 (0.77) | 0.81 (0.75) |
5. I feel I can’t stand it anymore | 0.79 (0.71) | 0.69 (0.62) | 0.79 (0.69) |
6. I become afraid that the pain will get worse | 0.73 (0.60) | 0.54 (0.36) | 0.78 (0.67) |
7. I keep thinking of other painful events | 0.55 (0.49) | 0.48 (0.34) | 0.54 (0.40) |
8. I anxiously want the pain to go away | 0.64 (0.58) | 0.65 (0.49) | 0.68 (0.59) |
9. I can’t seem to keep it out of my mind | 0.64 (0.58) | 0.66 (0.58) | 0.83 (0.77) |
10. I keep thinking about how much it hurts | 0.70 (0.71) | 0.69 (0.61) | 0.83 (0.78) |
11. I keep thinking about how badly I want the pain to stop | 0.76 (0.75) | 0.72 (0.61) | 0.79 (0.72) |
12. There’s nothing I can do to reduce the intensity of the pain | 0.60 (0.48) | 0.52 (0.33) | 0.68 (0.51) |
13. I wonder whether something serious may happen | 0.64 (0.58) | 0.55 (0.39) | 0.69 (0.54) |